National Bank (NBHC) 10-Q 4 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	NBHC
Entity Registrant Name	National Bank Holdings Corp
Entity Central Index Key	1,475,841
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		30,530,877
Entity Current Reporting Status	Yes

Consolidated Statements of Fina

Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 260,731	$ 193,297
Interest bearing bank deposits	26,139	64,067
Cash and cash equivalents	286,870	257,364
Investment securities available-for-sale (at fair value)	917,865	855,345
Investment securities held-to-maturity (at amortized cost)	283,369	258,730
Non-marketable securities	14,088	15,030
Loans	3,702,334	3,178,947
Allowance for loan losses	(30,686)	(31,264)
Loans, net	3,671,648	3,147,683
Loans held for sale	51,050	4,629
Other real estate owned	11,875	10,491
Premises and equipment, net	112,038	93,708
Goodwill	114,909	59,630
Intangible assets, net	15,561	1,607
Other assets	178,310	139,248
Total assets	5,657,583	4,843,465
Liabilities:
Non-interest bearing demand deposits	1,083,245	902,439
Interest bearing demand deposits	698,796	474,607
Savings and money market	1,779,817	1,484,463
Time deposits	1,147,452	1,118,050
Total deposits	4,709,310	3,979,559
Securities sold under agreements to repurchase	141,187	130,463
Federal Home Loan Bank advances	77,335	129,115
Other liabilities	83,888	71,921
Total liabilities	5,011,720	4,311,058
Shareholders' equity:
Common stock	515	515
Additional paid in capital	1,012,268	970,668
Retained earnings	68,008	60,795
Treasury stock at cost	(420,040)	(493,329)
Accumulated other comprehensive income (loss), net of tax	(14,888)	(6,242)
Total shareholders' equity	645,863	532,407
Total liabilities and shareholders' equity	$ 5,657,583	$ 4,843,465

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 278,716	$ 256,771
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	400,000,000	400,000,000
Common Stock, shares issued	51,516,335	51,518,162
Common Stock, shares outstanding	30,479,969	26,875,585
Treasury stock, shares	20,814,584	24,479,020

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income:
Interest and fees on loans	$ 45,280,000	$ 31,763,000
Interest and dividends on investment securities	6,526,000	6,613,000
Dividends on non-marketable securities	244,000	167,000
Interest on interest-bearing bank deposits	741,000	197,000
Total interest and dividend income	52,791,000	38,740,000
Interest expense:
Interest on deposits	4,634,000	3,787,000
Interest on borrowings	510,000	231,000
Total interest expense	5,144,000	4,018,000
Net interest income before provision for loan losses	47,647,000	34,722,000
Provision for loan losses	41,000	1,795,000
Net interest income after provision for loan losses	47,606,000	32,927,000
Non-interest income:
Service charges	4,510,000	3,326,000
Bank card fees	3,362,000	2,804,000
Gain on sale of mortgages, net	7,971,000	454,000
Bank-owned life insurance income	452,000	470,000
Other non-interest income	1,150,000	1,414,000
OREO related income	390,000	228,000
Total non-interest income	17,835,000	8,696,000
Non-interest expense:
Salaries and benefits	30,672,000	20,390,000
Occupancy and equipment	7,955,000	5,437,000
Telecommunications and data processing	4,366,000	1,587,000
Marketing and business development	1,224,000	651,000
FDIC deposit insurance	753,000	705,000
Bank card expenses	2,136,000	883,000
Professional fees	2,819,000	416,000
Other non-interest expense	3,845,000	2,406,000
Problem asset workout	781,000	872,000
Gain on OREO sales, net	78,000	(112,000)
Intangible asset amortization	653,000	1,370,000
Total non-interest expense	55,282,000	34,605,000
Income before income taxes	10,159,000	7,018,000
Income tax expense	1,695,000	(1,240,000)
Net income	$ 8,464,000	$ 8,258,000
Income per share-basic (in dollars per share)	$ 0.28	$ 0.31
Income per share-diluted (in dollars per share)	$ 0.27	$ 0.30
Weighted average number of common shares outstanding:
Basic (Shares)	30,493,689	26,801,773
Diluted (Shares)	31,143,528	27,680,029

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,464	$ 8,258
Securities available-for-sale:
Net unrealized gains (losses) arising during the period, net of tax	(6,780)	263
Less: amortization of net unrealized holding gains to income, net of tax	(387)	(357)
Other comprehensive income (loss)	(7,167)	(94)
Comprehensive income (loss)	$ 1,297	$ 8,164

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Tax (expense) benefit on net unrealized gains arising during the period	$ 2,301	$ (161)
Tax (expense) benefit of amortization of net unrealized holding gains to income	$ 70	$ 218

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income (loss), net [Member]	Total
Balance in the beginning at Dec. 31, 2016	$ 514	$ 984,087	$ 55,454	$ (502,104)	$ (1,762)	$ 536,189
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,258			8,258
Stock-based compensation		902				902
Issuance under purchase and equity compensation plans, including (gain) loss on reissuance of treasury stock		(11,314)		5,577		(5,737)
Cash dividends declared			(1,900)			(1,900)
Warrant exercise		(1,933)		1,933
Other comprehensive income (loss)					(94)	(94)
Balance in the ending at Mar. 31, 2017	514	971,742	61,812	(494,594)	(1,856)	537,618
Balance in the beginning at Dec. 31, 2017	515	970,668	60,795	(493,329)	(6,242)	532,407
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,464			8,464
Stock-based compensation		833				833
Issuance under purchase and equity compensation plans, including (gain) loss on reissuance of treasury stock		(1,476)		5,319		3,843
Reissuance of treasury stock for Peoples acquisition		42,243		67,970		110,213
Cash dividends declared			(2,756)			(2,756)
Reclassificaiton of tax effects from ASU 2018-02			1,479		(1,479)
Cumulative effect adjustment from ASU 2017-02			26			26
Other comprehensive income (loss)					(7,167)	(7,167)
Balance in the ending at Mar. 31, 2018	$ 515	$ 1,012,268	$ 68,008	$ (420,040)	$ (14,888)	$ 645,863

Consolidated Statements of Cha8

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Gain (loss) on reissuance of treasury stock	$ 3,566	$ (4,883)
Treasury Stock, shares, for Peoples acquisition	3,398,477
Cash dividends declared per share	$ 0.09	$ 0.07

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 8,464,000	$ 8,258,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	41,000	1,795,000
Depreciation and amortization	2,983,000	3,341,000
Current income tax receivable	(4,233,000)	444,000
Deferred income taxes	(609,000)	(1,734,000)
Net excess tax (benefit) deficit on stock-based compensation	(371,000)	(2,845,000)
Accretion Expense	6,508,000	6,191,000
Discount accretion, net of premium amortization	821,000	703,000
Gain on sale of mortgage loans, net	(6,803,000)	(454,000)
Origination of loans held for sale, net of repayments	(219,584,000)	(14,925,000)
Proceeds from sales of loans held for sale	235,104,000	32,194,000
Bank-owned life insurance income	(452,000)	(470,000)
Gain on the sale of other real estate owned, net	78,000	(112,000)
Impairment on other real estate owned	38,000	46,000
Loss (gain) on sale of fixed assets		(3,000)
Stock-based compensation	833,000	902,000
(Increase) decrease in other assets	(5,630,000)	(3,280,000)
(Decrease) increase in other liabilities	6,337,000	3,576,000
Net cash provided by (used in) operating activities	10,509,000	21,245,000
Cash flows from investing activities:
Purchase of FHLB stock	(2,950,000)
Proceeds from redemption of FHLB stock	8,690,000	1,884,000
Proceeds from maturities of investment securities held-to-maturity	15,526,000	18,350,000
Proceeds from maturities of investment securities available-for-sale	55,152,000	59,155,000
Proceeds from sales of investment securities available-for-sale	33,202,000
Purchase of investment securities available-for-sale	(42,199,000)	(96,948,000)
Purchase of investment securities held-to-maturity	(40,735,000)
Net increase in loans	9,136,000	(87,543,000)
Sales (purchases) of premises and equipment, net	(1,905,000)	(783,000)
Proceeds from sales of loans		20,269,000
Proceeds from sales of other real estate owned	36,000	755,000
Net cash activity from acquisitions	68,983,000
Net cash provided by (used in) investing activities	102,936,000	(84,861,000)
Cash flows from financing activities:
Net increase (decrease) in deposits	(160,000)	99,294,000
Increase (decrease) in repurchase agreements	10,724,000	(314,000)
Advances from FHLB		92,798,000
FHLB payoffs	(85,605,000)	(54,683,000)
Issuance of stock under purchase and equity compensation plans	(517,000)	(5,737,000)
Proceeds from exercise of stock options	4,360,000
Payment of dividends	(2,741,000)	(2,048,000)
Net cash proivded by (used in) financing activities	(73,939,000)	129,310,000
Increase (decrease) in cash, cash equivalents and restricted cash	39,506,000	65,694,000
Cash, cash equivalents and restricted cash at beginning of the year	257,364,000	152,736,000
Cash, cash equivalents and restricted cash at end of period	296,870,000	218,430,000
Supplemental disclosure of cash flow information during the period:
Cash paid for interest	3,723,000	2,745,000
Net tax (refunds) payments	164,000	(7,000)
Supplemental schedule of non-cash investing activities:
Loans transferred to other real estate owned at fair value	127,000	578,000
Loans purchased but not settled	(15,068,000)	16,141,000
Transfer of Loans Held-for-sale to Portfolio Loans	878,000	$ 3,825,000
Treasury stock reissued for acquisition of Peoples	$ 110,213,000

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	NATIONAL BANK HOLDINGS CORPORATION AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Unaudited) March 31, 2018 Note 1 Basis of Presentation National Bank Holdings Corporation ("NBHC" or the "Company") is a bank holding company that was incorporated in the State of Delaware in 2009 with the intent to acquire and operate financial services franchises and other complementary businesses in targeted markets. The Company is headquartered immediately south of Denver, in Greenwood Village, Colorado, and its primary operations are conducted through its wholly owned subsidiary, NBH Bank, (the "Bank"), a Colorado state-chartered bank and a member of the Federal Reserve System. The Company provides a variety of banking products to both commercial and consumer clients through a network of 104 banking centers located primarily in Colorado and the greater Kansas City region, and through online and mobile banking products and services. On January 1, 2018, the Company completed the acquisition of Peoples, Inc. Refer to note 3 – Acquisition Activities for further details. The accompanying interim unaudited consolidated financial statements serve to update the National Bank Holdings Corporation Annual Report on Form 10-K for the year ended December 31, 2017 and include the accounts of the Company and its wholly owned subsidiary, NBH Bank. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and where applicable, with general practices in the banking industry or guidelines prescribed by bank regulatory agencies. However, they may not include all information and notes necessary to constitute a complete set of financial statements under GAAP applicable to annual periods and accordingly should be read in conjunction with the financial information contained in the Company's most recent Form 10-K. The unaudited consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the results presented. All such adjustments are of a normal recurring nature. All significant intercompany balances and transactions have been eliminated in consolidation. Certain reclassifications of prior years' amounts are made whenever necessary to conform to current period presentation The results of operations for the interim period is not necessarily indicative of the results that may be expected for the full year or any other interim period. All amounts are in thousands, except share data, or as otherwise noted. GAAP requires management to make estimates that affect the reported amounts of assets, liabilities, revenues and expenses, and disclosures of contingent assets and liabilities. By their nature, estimates are based on judgment and available information. Management has made significant estimates in certain areas, such as the amount and timing of expected cash flows from assets, the valuation of other real estate owned (“OREO”), the fair value adjustments on assets acquired and liabilities assumed, the valuation of core deposit intangible assets, the valuation of investment securities for other-than-temporary impairment (“OTTI”), the valuation of stock-based compensation, the fair values of financial instruments, the allowance for loan losses (“ALL”), and contingent liabilities. Because of the inherent uncertainties associated with any estimation process and future changes in market and economic conditions, it is possible that actual results could differ significantly from those estimates. Beginning in the first quarter 2018, loans previously referred to as "non 310-30 loans" are referred to as "originated and acquired loans," which include acquired loans not accounted for under ASC 310-30. No amounts were reclassified resulting from this change in terminology. The Company's significant accounting policies followed in the preparation of the unaudited consolidated financial statements are disclosed in note 2 of the audited financial statements and notes for the year ended December 31, 2017 and are contained in the Company's Annual Report on Form 10-K. There have not been any significant changes to the application of significant accounting policies since December 31, 2017, except for the following additions: Mortgage Servicing– Mortgage servicing rights (“MSRs”) associated with loans originated and sold, where servicing is retained, are initially capitalized at fair value and included in intangible assets, net on the consolidated statements of financial condition. For subsequent measurement purposes, the Company measures servicing assets based on the lower of cost or market using the amortization method. The values of these capitalized servicing rights are amortized as an offset to the loan servicing income earned in relation to the servicing revenue expected to be earned. The carrying values of these rights are reviewed quarterly for impairment based on the fair value of those assets. For purposes of impairment evaluation and measurement, management stratifies MSRs based on the predominant risk characteristics of the underlying loans, including loan type and loan term. If, by individual stratum, the carrying amount of these MSRs exceeds fair value, a valuation allowance is established and the impairment is recognized in mortgage banking income. If the fair value of impaired MSRs subsequently increases, management recognizes the increase in fair value in current period mortgage banking income and, through a reduction in the valuation allowance, adjusts the carrying value of the MSRs to a level not in excess of amortized cost. Reserve for Mortgage Loan Repurchase Losses– The Company sells mortgage loans to various third parties, including government-sponsored entities, under contractual provisions that include various representations and warranties that typically cover ownership of the loan, compliance with loan criteria set forth in the applicable agreement, validity of the lien securing the loan, absence of delinquent taxes or liens against the property securing the loan, and similar matters. The Company may be required to repurchase the mortgage loans with identified defects, indemnify the investor or insurer, or reimburse the investor for credit loss incurred on the loan (collectively “repurchase”) in the event of a material breach of such contractual representations or warranties. Risk associated with potential repurchases or other forms of settlement is managed through underwriting and quality assurance practices and by servicing mortgage loans to meet investor and secondary market standards. The Company establishes mortgage repurchase reserves related to various representations and warranties that reflect management’s estimate of losses based on a combination of factors. Such factors incorporate actual and historic loss history, delinquency trends in the portfolio and economic conditions. The Company establishes a reserve at the time loans are sold and quarterly updates the reserve estimate during the estimated loan life. The repurchase reserve is included in other liabilities on the consolidated statements of financial condition.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Recent Accounting Pronouncements	Note 2 Recent Accounting Pronouncements Revenue from Contracts with Customers —In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . This update supersedes revenue recognition requirements in ASC Topic 605, Revenue Recognition , including most industry-specific revenue recognition guidance in the FASB Accounting Standards Codification. The new guidance stipulates that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides specific steps that entities should apply in order to achieve this principle. The amendments are effective for interim and annual periods beginning after December 15, 2017, with early application permitted for interim and annual periods beginning after December 15, 2016. ASU 2014-09 allows for either full retrospective or modified retrospective adoption. The new guidance does not apply to revenue associated with financial assets and liabilities including loans, leases, securities, and derivatives that are accounted for under other GAAP. Accordingly, the majority of the Company’s revenues are not affected. The Company adopted ASU No. 2014-09 on January 1, 2018 utilizing the modified retrospective approach. Additionally, the Company has determined certain service charges, bank card fees and real estate sales are within the scope of the ASU, but has not identified changes to the timing or amount of revenue recognition. Accounting policies and procedures did not change materially as the principals of revenue recognition from the ASU are largely consistent with existing guidance and current practices applied by the Company. Refer to note 11 of our consolidated financial statements for required disclosures under the new standard. Leases —In February 2016, the FASB issued ASU 2016-02, Leases. The guidance in ASU 2016-02 supersedes the lease recognition requirements in ASC Topic 840, Leases . The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statements. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company expects to adopt ASU 2016-02 in the first quarter of 2019 and is currently in the process of evaluating the impact of the ASU's adoption on the Company's consolidated financial statements . Financial Instruments - Credit Losses —In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments . This update replaces the current incurred loss methodology for recognizing credit losses with a current expected credit loss model, which requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. This amendment broadens the information that an entity must consider in developing its expected credit loss estimates. Additionally, the update amends the accounting for credit losses for available-for-sale debt securities and purchased financial assets with a more-than-insignificant amount of credit deterioration since origination. This update requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of a company’s loan portfolio. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption in fiscal years beginning after December 15, 2018 is permitted. The amendment requires the use of the modified retrospective approach for adoption. The Company is in the process of evaluating the impact of the ASU’s adoption on the Company’s consolidated financial statements. Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities —In August 2017, the FASB issued ASU 2017-12 , Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities. The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. ASU 2017-12 is effective for public business entities for annual and interim periods in fiscal years beginning after December 15, 2018. Early adoption is permitted, including in an interim period. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the consolidated statements of financial condition as of the date of adoption. The Company adopted ASU 2017-12 during the first quarter of 2018 and recorded a cumulative effect adjustment of $26 thousand within equity in the consolidated statements of financial condition. Reclassification of Certain Tax Effects —In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This update allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The amendments eliminate the stranded tax effects that were created as a result of the reduction of historical U.S. federal corporate income tax rate to the newly enacted U.S. federal corporate income tax rate. The update is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted, and is to be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. The Company early adopted ASU 2018-02 in the first quarter of 2018, resulting in a $1.5 million reclassification from accumulated other comprehensive loss to retained earnings on the consolidated statements of financial condition and the consolidated statements of changes in shareholders’ equity. The company adopted ASU 2016-01, Financial Instruments - Recognition and Measurement of Financial Assets and Financial Liabilities (Topic 825), ASU 2016-18, Restricted Cash (a consensus of the FASB Emerging Issues Task Force, ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payment s and ASU 2017-05 Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) with no material impact on its financial statements. The Company reviewed ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, and does not expect the adoption of this pronouncement to have a material impact on its financial statements.

Acquisition Activities 10Q

Acquisition Activities 10Q	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Acquisition Activities	Note 3 Acquisition Activities On January 1, 2018, the Company completed its acquisition of Peoples, Inc., the bank holding company of Colorado-based Peoples National Bank and Kansas-based Peoples Bank. Immediately following the completion of the acquisition, Peoples National Bank and Peoples Bank merged into NBH Bank. Pursuant to the merger agreement executed in June 2017, the Company paid $36.2 million of cash consideration and 3,398,477 shares of the Company’s Class A common stock in exchange for all of the outstanding common stock of Peoples. Included in the cash consideration is $10.0 million of restricted cash placed in escrow for certain potential liabilities the Company is indemnified for pursuant to the merger agreement. The restricted cash is included in other assets in the Company’s consolidated statements of financial condition at March 31, 2018. The transaction has a value of $146.4 million in the aggregate, based on the Company’s closing price of $32.43 on the acquisition date. Acquisition related costs of $7.6 million were included in the Company’s consolidated statements of operations for the three months ended March 31, 2018. The results of Peoples are included in the results of the Company subsequent to the acquisition date. The Company determined that this acquisition constitutes a business combination as defined in ASC Topic 805, Business Combinations . Accordingly, as of the date of the acquisition, the Company recorded the assets acquired and liabilities assumed at fair value. The Company determined fair values in accordance with the guidance provided in ASC Topic 820, Fair Value Measurements and Disclosures . Fair value is established by discounting the expected future cash flows with a market discount rate for like maturities and risk instruments. The estimation of expected future cash flows, market conditions and other future events and actual results could differ materially. The determination of the fair values of fixed assets, loans, OREO, core deposit intangible, mortgage servicing rights and mortgage repurchase reserve involves a high degree of judgment and complexity. The Company has made the determination of fair values using the best information available at the time; however, purchase accounting is not complete and the assumptions used are subject to change and, if changed, could have a material effect on the Company's financial position and results of operations. The table below summarizes the net assets acquired (at fair value) and consideration transferred in connection with the Peoples acquisition: Assets: Cash and due from banks $ 105,173 Investment securities available-for-sale 118,512 Non-marketable securities 4,796 Loans 542,707 Loans held for sale 54,260 Other real estate owned 1,409 Premises and equipment 18,584 Core deposit intangible asset 10,477 Mortgage servicing rights 4,301 Other assets 15,324 Total assets acquired $ 875,543 Liabilities: Total deposits 729,911 FHLB borrowings 33,825 Other liabilities 20,683 Total liabilities assumed $ 784,419 Identifiable net assets acquired $ 91,124 Consideration: NBHC common stock paid at January 1, 2018, closing price of $32.43 $ 110,213 Cash 36,189 Total $ 146,402 Estimated goodwill created $ 55,278 In connection with the Peoples acquisition, the Company recorded $55.3 million of goodwill, a $10.5 million core deposit intangible asset, a $4.3 million mortgage servicing rights intangible asset and a $4.0 million mortgage repurchase reserve, included in other liabilities. The core deposit intangible will be amortized straight-line over ten years and the mortgage servicing rights intangible is amortized in proportion to and over the period of the estimated net servicing income. The FHLB borrowings of $33.9 million were paid off during the first quarter of 2018. The fair value of the acquired assets and liabilities noted in the table may change during the provisional period, which may last up to twelve months subsequent to the acquisition date. The Company may obtain additional information to refine the valuation of the acquired assets and liabilities and adjust the recorded fair value. Adjustments recorded to the acquired assets and liabilities will be applied prospectively in accordance with ASU 2015-16. At the date of acquisition, none of the loans were accounted for under the guidance of ASC Topic 310-30, and the gross contractual amounts receivable, inclusive of all principal and interest, was $713.6 million. The Company’s best estimate of the contractual cash flows for loans not expected to be collected was $6.1 million. The following pro forma information combines the historical results of Peoples and the Company. The pro forma financial information does not include the potential impacts of possible business model changes, current market conditions, revenue enhancements, expense efficiencies, or other factors. If the Peoples acquisition had been completed on January 1, 2017, pro forma total revenue for the Company would have been approximately $65.5 million and $61.6 million for the three months ended March 31, 2018 and 2017, respectively. Pro forma net income for the Company would have been approximately $14.5 million and $9.9 million for the three month ended March 31, 2018 and 2017, respectively. Pro forma basic and dilutive earnings per share for the Company would have been $0.48 and $0.47 for the three months ended March 31, 2018, respectively, and $0.33 and $0.32 for the three months ended March 31, 2017, respectively. For the three months ended March 31, 2018, the pro forma information reflects adjustments made to exclude acquisition-related expenses of the Company of $7.6 million. For the three months ended March 31, 2017, the pro-forma information reflects adjustments made to include estimated amortization and accretion of purchase discounts and premiums of $0.2 million and estimated amortization of acquired identifiable intangibles of $0.3 million. The pro forma information is theoretical in nature and not necessarily indicative of future consolidated results of operations of the Company or the consolidated results of operations which would have resulted had the Company acquired Peoples during the periods presented. The Company has determined that it is impractical to report the amounts of revenue and earnings of legacy Peoples since the acquisition date due to the integration of operations shortly after the acquisition date. Accordingly, reliable and separate complete revenue and earnings information is no longer available. In addition, such amounts would require significant estimates related to the proper allocation of merger cost savings that cannot be objectively made.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 4 Investment Securities The Company’s investment securities portfolio is comprised of available-for-sale and held-to-maturity investment securities. These investment securities totaled $1.2 billion at March 31, 2018 and included $0.9 billion of available-for-sale securities and $0.3 billion of held-to-maturity securities. At December 31, 2017, investment securities totaled $1.1 billion and included $0.8 billion of available-for-sale securities and $0.3 billion of held-to-maturity securities. Available-for-sale At March 31, 2018 and December 31, 2017, the Company held $0.9 billion of available-for-sale investment securities. Available-for-sale securities are summarized as follows as of the dates indicated: March 31, 2018 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 189,430 $ 1,635 $ (2,435) $ 188,630 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 751,497 151 (23,919) 727,729 Municipal securities 1,054 — (17) 1,037 Other securities 469 — — 469 Total investment securities available-for-sale $ 942,450 $ 1,786 $ (26,371) $ 917,865 December 31, 2017 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 167,269 $ 2,371 $ (992) $ 168,648 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 702,107 351 (17,228) 685,230 Municipal securities 1,054 — (6) 1,048 Other securities 419 — — 419 Total investment securities available-for-sale $ 870,849 $ 2,722 $ (18,226) $ 855,345 At March 31, 2018 and December 31, 2017, mortgage-backed securities represented primarily all of the Company’s available-for-sale investment portfolio and all mortgage-backed securities were backed by government sponsored enterprises (“GSE”) collateral such as Federal Home Loan Mortgage Corporation (“FHLMC”) and Federal National Mortgage Association (“FNMA”), and the government sponsored agency Government National Mortgage Association (“GNMA”). The tables below summarize the available-for-sale securities with unrealized losses as of the dates shown, along with the length of the impairment period: March 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 99,713 $ (1,579) $ 32,040 $ (856) $ 131,753 $ (2,435) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 274,644 (3,894) 385,797 (20,025) 660,441 (23,919) Municipal securities 503 (17) — — 503 (17) Total $ 374,860 $ (5,490) $ 417,837 $ (20,881) $ 792,697 $ (26,371) December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 62,178 $ (408) $ 36,086 $ (584) $ 98,264 $ (992) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 162,346 (830) 412,967 (16,398) 575,313 (17,228) Municipal securities 514 (6) — — 514 (6) Total $ 225,038 $ (1,244) $ 449,053 $ (16,982) $ 674,091 $ (18,226) The unrealized losses in the Company's investment portfolio at March 31, 2018 were caused by changes in interest rates. The portfolio included 205 securities, having an aggregate fair value of $792.7 million, which were in an unrealized loss position at March 31, 2018, compared to 87 securities, with an aggregate fair value of $674.1 million at December 31, 2017. Management evaluated all of the available for sale securities in an unrealized loss position at March 31, 2018 and December 31, 2017, and identified one municipal security with other-than-temporary impairment (OTTI), with an aggregate fair value of $0.3 million and $0.3 million, respectively. No OTTI charges were recorded during the three months ended March 31, 2018 and 2017. The unrealized losses on the remaining securities in an unrealized loss position were caused by changes in interest rates. The Company has no intention to sell these securities before recovery of their amortized cost and believes it will not be required to sell the securities before the recovery of their amortized cost. Certain securities are pledged as collateral for public deposits, securities sold under agreements to repurchase, and to secure borrowing capacity at the Federal Reserve Bank and Federal Home Loan Bank (“FHLB”), if needed. The fair value of available-for-sale investment securities pledged as collateral totaled $427.8 million and $334.6 million at March 31, 2018 and December 31, 2017, respectively. Certain investment securities may also be pledged as collateral for the line of credit at the FHLB; at March 31, 2018 or December 31, 2017, no securities were pledged for this purpose. Mortgage-backed securities do not have a single maturity date and actual maturities may differ from contractual maturities depending on the repayment characteristics and experience of the underlying financial instruments. The estimated weighted average life of the available-for-sale mortgage-backed securities portfolio was 3.5 years and 3.4 years at March 31, 2018 and December 31, 2017, respectively. This estimate is based on assumptions and actual results may differ. At March 31, 2018 and December 31, 2017, the duration of the total available-for-sale investment portfolio was 3.1 years and 3.1 years, respectively. As of March 31, 2018, municipal securities with an amortized cost and fair value of $0.2 million were due after one year through five years, while municipal securities with an amortized cost and fair value of $0.5 million were due after five years through ten years. Other securities and municipal securities of $0.8 million as of March 31, 2018, have no stated contractual maturity date. Held-to-maturity At March 31, 2018 and December 31, 2017, the Company held $283.4 million and $258.7 million of held-to-maturity investment securities, respectively. Held-to-maturity investment securities are summarized as follows as of the dates indicated: March 31, 2018 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 191,136 $ 8 $ (2,535) $ 188,609 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 92,233 5 (2,131) 90,107 Total investment securities held-to-maturity $ 283,369 $ 13 $ (4,666) $ 278,716 December 31, 2017 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 204,352 $ 151 $ (455) $ 204,048 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 54,378 — (1,655) 52,723 Total investment securities held-to-maturity $ 258,730 $ 151 $ (2,110) $ 256,771 The tables below summarize the held-to-maturity securities with unrealized losses as of the dates shown, along with the length of the impairment period: March 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 171,017 $ (2,059) $ 16,202 $ (476) $ 187,219 $ (2,535) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 6,018 (139) 43,350 (1,992) 49,368 (2,131) Total $ 177,035 $ (2,198) $ 59,552 $ (2,468) $ 236,587 $ (4,666) December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 149,182 $ (220) $ 17,506 $ (235) $ 166,688 $ (455) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 6,460 (65) 46,264 (1,590) 52,724 (1,655) Total $ 155,642 $ (285) $ 63,770 $ (1,825) $ 219,412 $ (2,110) The held-to-maturity portfolio included 48 securities, having an aggregate fair value of $236.6 million, which were in an unrealized loss position at March 31, 2018, compared to 36 securities, with a fair value of $219.4 million, at December 31, 2017. Management evaluated all of the held-to-maturity securities in an unrealized loss position and concluded that no OTTI existed at March 31, 2018 or December 31, 2017. The unrealized losses in the Company's investments at March 31, 2018 were caused by changes in interest rates. The Company has no intention to sell these securities before recovery of their amortized cost and believes it will not be required to sell the securities before the recovery of their amortized cost. The carrying value of held-to-maturity investment securities pledged as collateral totaled $140.8 million and $142.0 million at March 31, 2018 and December 31, 2017, respectively. Actual maturities of mortgage-backed securities may differ from scheduled maturities depending on the repayment characteristics and experience of the underlying financial instruments. The estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio as of March 31, 2018 and December 31, 2017 was 3.1 years and 3.1 years, respectively. This estimate is based on assumptions and actual results may differ. The duration of the total held-to-maturity investment portfolio was 2.6 years and 2.8 years as of March 31, 2018 and December 31, 2017, respectively.

Loans

Loans	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans	90 30-59 60-89 than 90 originated and days past days past days past days past Total past acquired due and Non- due due due due Current loans still accruing accrual Originated and acquired loans: Commercial: Commercial and industrial $ 1,083 $ 116 $ 1,214 $ 2,413 $ 1,492,675 $ 1,495,088 $ 150 $ 5,302 Owner occupied commercial real estate 440 534 2,790 3,764 380,483 384,247 535 7,202 Agriculture 151 — 734 885 160,764 161,649 16 2,103 Energy — — 923 923 39,290 40,213 — 923 Total commercial 1,674 650 5,661 7,985 2,073,212 2,081,197 701 15,530 Commercial real estate non-owner occupied: Construction 465 941 642 2,048 110,038 112,086 642 — Acquisition/development — — 51 51 23,058 23,109 51 833 Multifamily — — 29 29 51,712 51,741 — 29 Non-owner occupied — 10 — 10 448,492 448,502 — 613 Total commercial real estate 465 951 722 2,138 633,300 635,438 693 1,475 Residential real estate: Senior lien 2,535 309 1,517 4,361 744,083 748,444 238 5,918 Junior lien 1,002 238 40 1,280 97,431 98,711 — 710 Total residential real estate 3,537 547 1,557 5,641 841,514 847,155 238 6,628 Consumer 204 22 140 366 25,869 26,235 135 36 Total originated and acquired loans $ 5,880 $ 2,170 $ 8,080 $ 16,130 $ 3,573,895 $ 3,590,025 $ 1,767 $ 23,669 December 31, 2017 Greater Total Loans > 90 30-59 60-89 than 90 originated and days past days past days past days past Total past acquired due and Non- due due due due Current loans still accruing accrual Originated and acquired loans: Commercial: Commercial and industrial $ 554 $ 117 $ 1,389 $ 2,060 $ 1,373,962 $ 1,376,022 $ 150 $ 7,767 Owner occupied commercial real estate 696 — 1,983 2,679 270,074 272,753 — 3,478 Agriculture 585 — 701 1,286 137,609 138,895 — 2,003 Energy — — 1,645 1,645 55,815 57,460 — 1,645 Total commercial 1,835 117 5,718 7,670 1,837,460 1,845,130 150 14,893 Commercial real estate non-owner occupied: Construction — — 179 179 107,502 107,681 — 179 Acquisition/development 1,097 — — 1,097 13,318 14,415 — — Multifamily — — — — 26,947 26,947 — — Non-owner occupied 56 — 574 630 335,468 336,098 — 605 Total commercial real estate 1,153 — 753 1,906 483,235 485,141 — 784 Residential real estate: Senior lien 1,167 885 1,396 3,448 643,034 646,482 — 4,724 Junior lien 233 91 41 365 56,631 56,996 — 459 Total residential real estate 1,400 976 1,437 3,813 699,665 703,478 — 5,183 Consumer 157 6 5 168 24,407 24,575 — 140 Total originated and acquired loans $ 4,545 $ 1,099 $ 7,913 $ 13,557 $ 3,044,767 $ 3,058,324 $ 150 $ 21,000 Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the due date of the scheduled payment. Pooled loans accounted for under ASC 310-30 that are 90 days or more past due and still accreting are generally considered to be performing and therefore are not included in the tables above. Non-accrual loans include troubled debt restructurings on non-accrual status. Non-accrual originated and acquired loans totaled $23.7 million at March 31, 2018, increasing $2.7 million, or 12.7% from December 31, 2017, due to acquired Peoples loans on non-accrual of $5.7 million, partially offset by one previously identified commercial and industrial loan of $2.3 million placed back on accrual during the first quarter of 2018. The Company’s internal risk rating system uses a series of grades which reflect our assessment of the credit quality of loans based on an analysis of the borrower's financial condition, liquidity and ability to meet contractual debt service requirements. Loans that are perceived to have acceptable risk are categorized as “Pass” loans. “Special mention” loans represent loans that have potential credit weaknesses that deserve close attention. Special mention loans include borrowers that have potential weaknesses or unwarranted risks that, unless corrected, may threaten the borrower's ability to meet debt service requirements. However, these borrowers are still believed to have the ability to respond to and resolve the financial issues that threaten their financial situation. Loans classified as “Substandard” have a well-defined credit weakness and are inadequately protected by the current paying capacity of the obligor or of the collateral pledged, if any. Although these loans are identified as potential problem loans, they may never become non-performing. Substandard loans have a distinct possibility of loss if the deficiencies are not corrected. “Doubtful” loans are loans that management believes the collection of payments in accordance with the terms of the loan agreement are highly questionable and improbable. Doubtful loans are deemed impaired and put on non-accrual status. Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows at March 31, 2018 and December 31, 2017: March 31, 2018 Special Pass mention Substandard Doubtful Total Originated and acquired loans: Commercial: Commercial and industrial $ 1,460,896 $ 13,070 $ 20,219 $ 903 $ 1,495,088 Owner occupied commercial real estate 348,533 25,493 10,148 73 384,247 Agriculture 156,059 3,487 1,902 201 161,649 Energy 39,290 — 923 — 40,213 Total commercial 2,004,778 42,050 33,192 1,177 2,081,197 Commercial real estate non-owner occupied: Construction 110,850 — 1,236 — 112,086 Acquisition/development 22,276 — 833 — 23,109 Multifamily 49,605 — 2,136 — 51,741 Non-owner occupied 430,437 15,133 2,932 — 448,502 Total commercial real estate 613,168 15,133 7,137 — 635,438 Residential real estate: Senior lien 736,336 5,720 6,388 — 748,444 Junior lien 97,103 547 1,061 — 98,711 Total residential real estate 833,439 6,267 7,449 — 847,155 Consumer 26,197 1 37 — 26,235 Total originated and acquired loans $ 3,477,582 $ 63,451 $ 47,815 $ 1,177 $ 3,590,025 Loans accounted for under ASC 310-30: Commercial $ 19,846 $ 1,073 $ 3,783 $ — $ 24,702 Commercial real estate non-owner occupied 48,174 912 26,191 — 75,277 Residential real estate 9,306 1,074 1,620 — 12,000 Consumer 208 8 114 — 330 Total loans accounted for under ASC 310-30 $ 77,534 $ 3,067 $ 31,708 $ — $ 112,309 Total loans $ 3,555,116 $ 66,518 $ 79,523 $ 1,177 $ 3,702,334 December 31, 2017 Special Pass mention Substandard Doubtful Total Originated and acquired loans: Commercial: Commercial and industrial $ 1,349,116 $ 10,829 $ 14,824 $ 1,253 $ 1,376,022 Owner occupied commercial real estate 250,224 17,030 5,424 75 272,753 Agriculture 118,068 18,824 1,870 133 138,895 Energy 55,814 — 1,646 — 57,460 Total commercial 1,773,222 46,683 23,764 1,461 1,845,130 Commercial real estate non-owner occupied: Construction 107,502 — 179 — 107,681 Acquisition/development 14,415 — — — 14,415 Multifamily 24,817 — 2,130 — 26,947 Non-owner occupied 333,225 1,396 1,477 — 336,098 Total commercial real estate 479,959 1,396 3,786 — 485,141 Residential real estate: Senior lien 641,294 91 5,097 — 646,482 Junior lien 56,172 — 824 — 56,996 Total residential real estate 697,466 91 5,921 — 703,478 Consumer 24,432 1 142 — 24,575 Total originated and acquired loans $ 2,975,079 $ 48,171 $ 33,613 $ 1,461 $ 3,058,324 Loans accounted for under ASC 310-30: Commercial $ 23,954 $ 1,070 $ 4,451 $ — $ 29,475 Commercial real estate non-owner occupied 50,537 883 26,488 — 77,908 Residential real estate 10,072 1,055 1,632 — 12,759 Consumer 327 9 145 — 481 Total loans accounted for under ASC 310-30 $ 84,890 $ 3,017 $ 32,716 $ — $ 120,623 Total loans $ 3,059,969 $ 51,188 $ 66,329 $ 1,461 $ 3,178,947 Originated and acquired special mention loans increased $15.3 million from December 31, 2017, primarily due to increases in commercial and industrial, owner occupied commercial real estate and non-owner occupied commercial real estate sectors from the Peoples acquisition, offset by upgrades to pass within the agriculture sector. Originated and acquired substandard loans increased $14.2 million from December 31, 2017, primarily due to increases in the commercial and industrial and owner occupied commercial real estate sectors from the Peoples acquisition. Impaired Loans Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due in accordance with the contractual terms of the loan agreement. Impaired loans are comprised of originated and acquired loans on non-accrual status, loans in bankruptcy, and troubled debt restructurings (“TDRs”) described below. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral dependent loans. At March 31, 2018, the Company measured $17.9 million of impaired loans based on the fair value of the collateral less selling costs and $2.3 million of impaired loans using discounted cash flows and the loan’s initial contractual effective interest rate. Impaired loans totaling $8.7 million that individually were less than $250 thousand each, were measured through the general ALL reserves due to their relatively small size. Impaired loans acquired from Peoples totaling $5.8 million were marked to fair value at the date of acquisition. At March 31, 2018 and December 31, 2017, the Company’s recorded investment in impaired loans were $34.7 million and $30.9 million, respectively, of which $8.7 million and $8.5 million, respectively, were accruing TDRs. Impaired loans at March 31, 2018 were primarily comprised of seven relationships totaling $14.9 million. Three of the relationships were in the commercial and industrial sector totaling $7.5 million, two of the relationships were in the owner occupied commercial real estate sector totaling $4.9 million, one of the relationships was in the energy sector totaling $1.3 million and one relationship was in the agricultural sector totaling $1.2 million. Impaired loans had a collective related allowance for loan losses allocated to them of $1.2 million and $1.5 million at March 31, 2018 and December 31, 2017, respectively. Additional information regarding impaired loans at March 31, 2018 and December 31, 2017 is set forth in the table below: March 31, 2018 December 31, 2017 Allowance Allowance Unpaid for loan Unpaid for loan principal Recorded losses principal Recorded losses balance investment allocated balance investment allocated With no related allowance recorded: Commercial: Commercial and industrial $ 7,036 $ 5,562 $ — $ 6,481 $ 5,055 $ — Owner occupied commercial real estate 7,726 7,464 — 4,186 3,934 — Agriculture 1,508 1,259 — 1,502 1,245 — Energy 6,889 2,171 — 8,661 3,861 — Total commercial 23,159 16,456 — 20,830 14,095 — Commercial real estate non-owner occupied: Construction — — — 215 179 — Acquisition/development 1,065 833 — — — — Multifamily 29 29 — 29 29 — Non-owner occupied 962 845 — 901 853 — Total commercial real estate 2,056 1,707 — 1,145 1,061 — Residential real estate: Senior lien 1,738 1,563 — 333 309 — Junior lien 393 300 — — — — Total residential real estate 2,131 1,863 — 333 309 — Consumer 42 39 — — — — Total impaired loans with no related allowance recorded $ 27,388 $ 20,065 $ — $ 22,308 $ 15,465 $ — With a related allowance recorded: Commercial: Commercial and industrial $ 6,884 $ 4,284 $ 906 $ 7,919 $ 5,339 $ 1,329 Owner occupied commercial real estate 1,421 1,253 78 873 713 4 Agriculture 2,225 2,182 201 2,122 2,083 133 Energy — — — — — — Total commercial 10,530 7,719 1,185 10,914 8,135 1,466 Commercial real estate non-owner occupied: Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Non-owner occupied 200 193 1 207 200 1 Total commercial real estate 200 193 1 207 200 1 Residential real estate: Senior lien 6,329 5,553 24 6,481 5,753 24 Junior lien 1,262 1,142 7 1,295 1,179 8 Total residential real estate 7,591 6,695 31 7,776 6,932 32 Consumer — — — 146 141 1 Total impaired loans with a related allowance recorded $ 18,321 $ 14,607 $ 1,217 $ 19,043 $ 15,408 $ 1,500 Total impaired loans $ 45,709 $ 34,672 $ 1,217 $ 41,351 $ 30,873 $ 1,500 The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented: For the three months ended March 31, 2018 March 31, 2017 Average Interest Average Interest With no related allowance recorded: Commercial: Commercial and industrial $ 5,534 $ 83 $ 8,095 $ 48 Owner occupied commercial real estate 7,487 18 3,885 18 Agriculture 1,259 6 2,588 — Energy 2,353 20 6,098 — Total commercial 16,633 127 20,666 66 Commercial real estate non-owner occupied: Construction — — — — Acquisition/development 886 — — — Multifamily — — — — Non-owner occupied 876 4 329 7 Total commercial real estate 1,762 4 329 7 Residential real estate: Senior lien 1,612 — 1,047 3 Junior lien 305 — — — Total residential real estate 1,917 — 1,047 3 Consumer 14 — 4 — Total impaired loans with no related allowance recorded $ 20,326 $ 131 $ 22,046 $ 76 With a related allowance recorded: Commercial: Commercial and industrial $ 4,339 $ — $ 3,445 $ — Owner occupied commercial real estate 1,265 5 678 5 Agriculture 2,126 1 156 1 Energy — — 6,589 — Total commercial 7,730 6 10,868 6 Commercial real estate non-owner occupied: Construction — — — — Acquisition/development — — — — Multifamily 29 — 32 — Non-owner occupied 196 2 223 3 Total commercial real estate 225 2 255 3 Residential real estate: Senior lien 5,601 13 5,791 21 Junior lien 1,151 9 1,625 13 Total residential real estate 6,752 22 7,416 34 Consumer 24 — 181 — Total impaired loans with a related allowance recorded $ 14,731 $ 30 $ 18,720 $ 43 Total impaired loans $ 35,057 $ 161 $ 40,766 $ 119 Interest income recognized on impaired loans noted in the table above primarily represents interest earned on accruing troubled debt restructurings. Interest income recognized on impaired loans during the three months ended March 31, 2018 and 2017 was $0.2 million and $0.1 million, respectively. Troubled debt restructurings The Company’s policy is to review each prospective credit to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include restructuring a loan to provide a concession by the Company to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Additionally, if a borrower’s repayment obligation has been discharged by a court, and that debt has not been reaffirmed by the borrower, regardless of past due status, the loan is considered to be a TDR. During the three months ended March 31, 2018, the Company restructured four loans with a recorded investment of $0.9 million to facilitate repayment. All of the loan modifications were a reduction of the principal payment, a reduction in interest rate, or an extension of term. Loan modifications to loans accounted for under ASC 310-30 are not considered TDRs. The tables below provide additional information related to accruing TDRs at March 31, 2018 and December 31, 2017: March 31, 2018 Recorded Average year-to-date Unpaid Unfunded commitments investment recorded investment principal balance to fund TDRs Commercial $ 7,045 $ 6,985 $ 7,832 $ 1,902 Commercial real estate non-owner occupied 426 431 471 — Residential real estate 1,205 1,213 1,214 2 Consumer — — — — Total $ 8,676 $ 8,629 $ 9,517 $ 1,904 December 31, 2017 Recorded Average year-to-date Unpaid Unfunded commitments investment recorded investment principal balance to fund TDRs Commercial $ 6,595 $ 7,308 $ 7,171 $ 2,041 Commercial real estate non-owner occupied 455 489 500 — Residential real estate 1,409 1,461 1,420 2 Consumer 1 3 1 — Total $ 8,460 $ 9,261 $ 9,092 $ 2,043 The following table summarizes the Company’s carrying value of non-accrual TDRs as of March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 Commercial $ 3,113 $ 5,808 Commercial real estate non-owner occupied 29 — Residential real estate 1,537 1,336 Consumer — 111 Total non-accruing TDRs $ 4,679 $ 7,255 At March 31, 2018 and December 31, 2017, the Company had $8.7 million and $8.5 million, respectively, of accruing TDRs that had been restructured from the original terms in order to facilitate repayment. Accrual of interest is resumed on loans that were on non-accrual only after the loan has performed sufficiently. The Company had one TDR that was modified within the past twelve months and had defaulted on its restructured terms during the three months ended March 31, 2018. The defaulted TDR consisted of one commercial real estate non-owner occupied loan totaling $0.2 million. Non-accruing TDRs decreased $2.6 million from December 31, 2017 due to one previously identified commercial and industrial loan of $2.3 million placed back on accrual during the period. The allowance for loan losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. During the three months ended March 31, 2017, the Company had one TDR that was modified within the past twelve months and had defaulted on its restructured terms. For purposes of this disclosure, the Company considers “default” to mean 90 days or more past due on principal or interest. Loans accounted for under ASC 310-30 Loan pools accounted for under ASC Topic 310-30 are periodically re-measured to determine expected future cash flows. In determining the expected cash flows, the timing of cash flows and prepayment assumptions for smaller homogeneous loans are based on statistical models that take into account factors such as the loan interest rate, credit profile of the borrowers, the years in which the loans were originated, and whether the loans are fixed or variable rate loans. Prepayments may be assumed on loans if circumstances specific to that loan warrant a prepayment assumption. The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the three months ended March 31, 2018 and 2017: March 31, 2018 March 31, 2017 Accretable yield beginning balance $ 46,568 $ 60,476 Reclassification from non-accretable difference 5,409 5,385 Reclassification to non-accretable difference (1,390) (399) Accretion (5,394) (5,871) Accretable yield ending balance $ 45,193 $ 59,591 Below is the composition of the net book value for loans accounted for under ASC 310-30 at March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 Contractual cash flows $ 488,637 $ 489,892 Non-accretable difference (331,135) (322,701) Accretable yield (45,193) (46,568) Loans accounted for under ASC 310-30 $ 112,309 $ 120,623" id="sjs-B4">Note 5 Loans The loan portfolio is comprised of loans originated by the Company and loans that were acquired in connection with the Company’s acquisitions. Beginning in the first quarter 2018, loans previously referred to as "non 310-30 loans" are referred to as "originated and acquired loans," which include acquired loans not accounted for under ASC 310-30. No amounts were reclassified resulting from this change in terminology. The tables below show the loan portfolio composition including carrying value by segment of loans accounted for under ASC Topic 310-30, Receivables—Loans and Debt Securities Acquired with Deteriorated Credit Quality, and originated and acquired loans, as of the dates shown. The carrying value of originated and acquired loans is net of discounts, fees, cost and fair value marks of $11.2 million and $4.3 million as of March 31, 2018 and December 31, 2017, respectively. March 31, 2018 ASC Originated and 310-30 loans acquired loans Total loans % of total Commercial $ 24,702 $ 2,081,197 $ 2,105,899 Commercial real estate non-owner occupied 75,277 635,438 710,715 Residential real estate 12,000 847,155 859,155 Consumer 330 26,235 26,565 Total $ 112,309 $ 3,590,025 $ 3,702,334 December 31, 2017 ASC Originated and 310-30 loans acquired loans Total loans % of total Commercial $ 29,475 $ 1,845,130 $ 1,874,605 Commercial real estate non-owner occupied 77,908 485,141 563,049 Residential real estate 12,759 703,478 716,237 Consumer 481 24,575 25,056 Total $ 120,623 $ 3,058,324 $ 3,178,947 Delinquency for originated and acquired loans is shown in the following tables at March 31, 2018 and December 31, 2017: March 31, 2018 Greater Total Loans > 90 30-59 60-89 than 90 originated and days past days past days past days past Total past acquired due and Non- due due due due Current loans still accruing accrual Originated and acquired loans: Commercial: Commercial and industrial $ 1,083 $ 116 $ 1,214 $ 2,413 $ 1,492,675 $ 1,495,088 $ 150 $ 5,302 Owner occupied commercial real estate 440 534 2,790 3,764 380,483 384,247 535 7,202 Agriculture 151 — 734 885 160,764 161,649 16 2,103 Energy — — 923 923 39,290 40,213 — 923 Total commercial 1,674 650 5,661 7,985 2,073,212 2,081,197 701 15,530 Commercial real estate non-owner occupied: Construction 465 941 642 2,048 110,038 112,086 642 — Acquisition/development — — 51 51 23,058 23,109 51 833 Multifamily — — 29 29 51,712 51,741 — 29 Non-owner occupied — 10 — 10 448,492 448,502 — 613 Total commercial real estate 465 951 722 2,138 633,300 635,438 693 1,475 Residential real estate: Senior lien 2,535 309 1,517 4,361 744,083 748,444 238 5,918 Junior lien 1,002 238 40 1,280 97,431 98,711 — 710 Total residential real estate 3,537 547 1,557 5,641 841,514 847,155 238 6,628 Consumer 204 22 140 366 25,869 26,235 135 36 Total originated and acquired loans $ 5,880 $ 2,170 $ 8,080 $ 16,130 $ 3,573,895 $ 3,590,025 $ 1,767 $ 23,669 December 31, 2017 Greater Total Loans > 90 30-59 60-89 than 90 originated and days past days past days past days past Total past acquired due and Non- due due due due Current loans still accruing accrual Originated and acquired loans: Commercial: Commercial and industrial $ 554 $ 117 $ 1,389 $ 2,060 $ 1,373,962 $ 1,376,022 $ 150 $ 7,767 Owner occupied commercial real estate 696 — 1,983 2,679 270,074 272,753 — 3,478 Agriculture 585 — 701 1,286 137,609 138,895 — 2,003 Energy — — 1,645 1,645 55,815 57,460 — 1,645 Total commercial 1,835 117 5,718 7,670 1,837,460 1,845,130 150 14,893 Commercial real estate non-owner occupied: Construction — — 179 179 107,502 107,681 — 179 Acquisition/development 1,097 — — 1,097 13,318 14,415 — — Multifamily — — — — 26,947 26,947 — — Non-owner occupied 56 — 574 630 335,468 336,098 — 605 Total commercial real estate 1,153 — 753 1,906 483,235 485,141 — 784 Residential real estate: Senior lien 1,167 885 1,396 3,448 643,034 646,482 — 4,724 Junior lien 233 91 41 365 56,631 56,996 — 459 Total residential real estate 1,400 976 1,437 3,813 699,665 703,478 — 5,183 Consumer 157 6 5 168 24,407 24,575 — 140 Total originated and acquired loans $ 4,545 $ 1,099 $ 7,913 $ 13,557 $ 3,044,767 $ 3,058,324 $ 150 $ 21,000 Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the due date of the scheduled payment. Pooled loans accounted for under ASC 310-30 that are 90 days or more past due and still accreting are generally considered to be performing and therefore are not included in the tables above. Non-accrual loans include troubled debt restructurings on non-accrual status. Non-accrual originated and acquired loans totaled $23.7 million at March 31, 2018, increasing $2.7 million, or 12.7% from December 31, 2017, due to acquired Peoples loans on non-accrual of $5.7 million, partially offset by one previously identified commercial and industrial loan of $2.3 million placed back on accrual during the first quarter of 2018. The Company’s internal risk rating system uses a series of grades which reflect our assessment of the credit quality of loans based on an analysis of the borrower's financial condition, liquidity and ability to meet contractual debt service requirements. Loans that are perceived to have acceptable risk are categorized as “Pass” loans. “Special mention” loans represent loans that have potential credit weaknesses that deserve close attention. Special mention loans include borrowers that have potential weaknesses or unwarranted risks that, unless corrected, may threaten the borrower's ability to meet debt service requirements. However, these borrowers are still believed to have the ability to respond to and resolve the financial issues that threaten their financial situation. Loans classified as “Substandard” have a well-defined credit weakness and are inadequately protected by the current paying capacity of the obligor or of the collateral pledged, if any. Although these loans are identified as potential problem loans, they may never become non-performing. Substandard loans have a distinct possibility of loss if the deficiencies are not corrected. “Doubtful” loans are loans that management believes the collection of payments in accordance with the terms of the loan agreement are highly questionable and improbable. Doubtful loans are deemed impaired and put on non-accrual status. Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows at March 31, 2018 and December 31, 2017: March 31, 2018 Special Pass mention Substandard Doubtful Total Originated and acquired loans: Commercial: Commercial and industrial $ 1,460,896 $ 13,070 $ 20,219 $ 903 $ 1,495,088 Owner occupied commercial real estate 348,533 25,493 10,148 73 384,247 Agriculture 156,059 3,487 1,902 201 161,649 Energy 39,290 — 923 — 40,213 Total commercial 2,004,778 42,050 33,192 1,177 2,081,197 Commercial real estate non-owner occupied: Construction 110,850 — 1,236 — 112,086 Acquisition/development 22,276 — 833 — 23,109 Multifamily 49,605 — 2,136 — 51,741 Non-owner occupied 430,437 15,133 2,932 — 448,502 Total commercial real estate 613,168 15,133 7,137 — 635,438 Residential real estate: Senior lien 736,336 5,720 6,388 — 748,444 Junior lien 97,103 547 1,061 — 98,711 Total residential real estate 833,439 6,267 7,449 — 847,155 Consumer 26,197 1 37 — 26,235 Total originated and acquired loans $ 3,477,582 $ 63,451 $ 47,815 $ 1,177 $ 3,590,025 Loans accounted for under ASC 310-30: Commercial $ 19,846 $ 1,073 $ 3,783 $ — $ 24,702 Commercial real estate non-owner occupied 48,174 912 26,191 — 75,277 Residential real estate 9,306 1,074 1,620 — 12,000 Consumer 208 8 114 — 330 Total loans accounted for under ASC 310-30 $ 77,534 $ 3,067 $ 31,708 $ — $ 112,309 Total loans $ 3,555,116 $ 66,518 $ 79,523 $ 1,177 $ 3,702,334 December 31, 2017 Special Pass mention Substandard Doubtful Total Originated and acquired loans: Commercial: Commercial and industrial $ 1,349,116 $ 10,829 $ 14,824 $ 1,253 $ 1,376,022 Owner occupied commercial real estate 250,224 17,030 5,424 75 272,753 Agriculture 118,068 18,824 1,870 133 138,895 Energy 55,814 — 1,646 — 57,460 Total commercial 1,773,222 46,683 23,764 1,461 1,845,130 Commercial real estate non-owner occupied: Construction 107,502 — 179 — 107,681 Acquisition/development 14,415 — — — 14,415 Multifamily 24,817 — 2,130 — 26,947 Non-owner occupied 333,225 1,396 1,477 — 336,098 Total commercial real estate 479,959 1,396 3,786 — 485,141 Residential real estate: Senior lien 641,294 91 5,097 — 646,482 Junior lien 56,172 — 824 — 56,996 Total residential real estate 697,466 91 5,921 — 703,478 Consumer 24,432 1 142 — 24,575 Total originated and acquired loans $ 2,975,079 $ 48,171 $ 33,613 $ 1,461 $ 3,058,324 Loans accounted for under ASC 310-30: Commercial $ 23,954 $ 1,070 $ 4,451 $ — $ 29,475 Commercial real estate non-owner occupied 50,537 883 26,488 — 77,908 Residential real estate 10,072 1,055 1,632 — 12,759 Consumer 327 9 145 — 481 Total loans accounted for under ASC 310-30 $ 84,890 $ 3,017 $ 32,716 $ — $ 120,623 Total loans $ 3,059,969 $ 51,188 $ 66,329 $ 1,461 $ 3,178,947 Originated and acquired special mention loans increased $15.3 million from December 31, 2017, primarily due to increases in commercial and industrial, owner occupied commercial real estate and non-owner occupied commercial real estate sectors from the Peoples acquisition, offset by upgrades to pass within the agriculture sector. Originated and acquired substandard loans increased $14.2 million from December 31, 2017, primarily due to increases in the commercial and industrial and owner occupied commercial real estate sectors from the Peoples acquisition. Impaired Loans Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due in accordance with the contractual terms of the loan agreement. Impaired loans are comprised of originated and acquired loans on non-accrual status, loans in bankruptcy, and troubled debt restructurings (“TDRs”) described below. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral dependent loans. At March 31, 2018, the Company measured $17.9 million of impaired loans based on the fair value of the collateral less selling costs and $2.3 million of impaired loans using discounted cash flows and the loan’s initial contractual effective interest rate. Impaired loans totaling $8.7 million that individually were less than $250 thousand each, were measured through the general ALL reserves due to their relatively small size. Impaired loans acquired from Peoples totaling $5.8 million were marked to fair value at the date of acquisition. At March 31, 2018 and December 31, 2017, the Company’s recorded investment in impaired loans were $34.7 million and $30.9 million, respectively, of which $8.7 million and $8.5 million, respectively, were accruing TDRs. Impaired loans at March 31, 2018 were primarily comprised of seven relationships totaling $14.9 million. Three of the relationships were in the commercial and industrial sector totaling $7.5 million, two of the relationships were in the owner occupied commercial real estate sector totaling $4.9 million, one of the relationships was in the energy sector totaling $1.3 million and one relationship was in the agricultural sector totaling $1.2 million. Impaired loans had a collective related allowance for loan losses allocated to them of $1.2 million and $1.5 million at March 31, 2018 and December 31, 2017, respectively. Additional information regarding impaired loans at March 31, 2018 and December 31, 2017 is set forth in the table below: March 31, 2018 December 31, 2017 Allowance Allowance Unpaid for loan Unpaid for loan principal Recorded losses principal Recorded losses balance investment allocated balance investment allocated With no related allowance recorded: Commercial: Commercial and industrial $ 7,036 $ 5,562 $ — $ 6,481 $ 5,055 $ — Owner occupied commercial real estate 7,726 7,464 — 4,186 3,934 — Agriculture 1,508 1,259 — 1,502 1,245 — Energy 6,889 2,171 — 8,661 3,861 — Total commercial 23,159 16,456 — 20,830 14,095 — Commercial real estate non-owner occupied: Construction — — — 215 179 — Acquisition/development 1,065 833 — — — — Multifamily 29 29 — 29 29 — Non-owner occupied 962 845 — 901 853 — Total commercial real estate 2,056 1,707 — 1,145 1,061 — Residential real estate: Senior lien 1,738 1,563 — 333 309 — Junior lien 393 300 — — — — Total residential real estate 2,131 1,863 — 333 309 — Consumer 42 39 — — — — Total impaired loans with no related allowance recorded $ 27,388 $ 20,065 $ — $ 22,308 $ 15,465 $ — With a related allowance recorded: Commercial: Commercial and industrial $ 6,884 $ 4,284 $ 906 $ 7,919 $ 5,339 $ 1,329 Owner occupied commercial real estate 1,421 1,253 78 873 713 4 Agriculture 2,225 2,182 201 2,122 2,083 133 Energy — — — — — — Total commercial 10,530 7,719 1,185 10,914 8,135 1,466 Commercial real estate non-owner occupied: Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Non-owner occupied 200 193 1 207 200 1 Total commercial real estate 200 193 1 207 200 1 Residential real estate: Senior lien 6,329 5,553 24 6,481 5,753 24 Junior lien 1,262 1,142 7 1,295 1,179 8 Total residential real estate 7,591 6,695 31 7,776 6,932 32 Consumer — — — 146 141 1 Total impaired loans with a related allowance recorded $ 18,321 $ 14,607 $ 1,217 $ 19,043 $ 15,408 $ 1,500 Total impaired loans $ 45,709 $ 34,672 $ 1,217 $ 41,351 $ 30,873 $ 1,500 The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented: For the three months ended March 31, 2018 March 31, 2017 Average Interest Average Interest With no related allowance recorded: Commercial: Commercial and industrial $ 5,534 $ 83 $ 8,095 $ 48 Owner occupied commercial real estate 7,487 18 3,885 18 Agriculture 1,259 6 2,588 — Energy 2,353 20 6,098 — Total commercial 16,633 127 20,666 66 Commercial real estate non-owner occupied: Construction — — — — Acquisition/development 886 — — — Multifamily — — — — Non-owner occupied 876 4 329 7 Total commercial real estate 1,762 4 329 7 Residential real estate: Senior lien 1,612 — 1,047 3 Junior lien 305 — — — Total residential real estate 1,917 — 1,047 3 Consumer 14 — 4 — Total impaired loans with no related allowance recorded $ 20,326 $ 131 $ 22,046 $ 76 With a related allowance recorded: Commercial: Commercial and industrial $ 4,339 $ — $ 3,445 $ — Owner occupied commercial real estate 1,265 5 678 5 Agriculture 2,126 1 156 1 Energy — — 6,589 — Total commercial 7,730 6 10,868 6 Commercial real estate non-owner occupied: Construction — — — — Acquisition/development — — — — Multifamily 29 — 32 — Non-owner occupied 196 2 223 3 Total commercial real estate 225 2 255 3 Residential real estate: Senior lien 5,601 13 5,791 21 Junior lien 1,151 9 1,625 13 Total residential real estate 6,752 22 7,416 34 Consumer 24 — 181 — Total impaired loans with a related allowance recorded $ 14,731 $ 30 $ 18,720 $ 43 Total impaired loans $ 35,057 $ 161 $ 40,766 $ 119 Interest income recognized on impaired loans noted in the table above primarily represents interest earned on accruing troubled debt restructurings. Interest income recognized on impaired loans during the three months ended March 31, 2018 and 2017 was $0.2 million and $0.1 million, respectively. Troubled debt restructurings The Company’s policy is to review each prospective credit to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include restructuring a loan to provide a concession by the Company to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Additionally, if a borrower’s repayment obligation has been discharged by a court, and that debt has not been reaffirmed by the borrower, regardless of past due status, the loan is considered to be a TDR. During the three months ended March 31, 2018, the Company restructured four loans with a recorded investment of $0.9 million to facilitate repayment. All of the loan modifications were a reduction of the principal payment, a reduction in interest rate, or an extension of term. Loan modifications to loans accounted for under ASC 310-30 are not considered TDRs. The tables below provide additional information related to accruing TDRs at March 31, 2018 and December 31, 2017: March 31, 2018 Recorded Average year-to-date Unpaid Unfunded commitments investment recorded investment principal balance to fund TDRs Commercial $ 7,045 $ 6,985 $ 7,832 $ 1,902 Commercial real estate non-owner occupied 426 431 471 — Residential real estate 1,205 1,213 1,214 2 Consumer — — — — Total $ 8,676 $ 8,629 $ 9,517 $ 1,904 December 31, 2017 Recorded Average year-to-date Unpaid Unfunded commitments investment recorded investment principal balance to fund TDRs Commercial $ 6,595 $ 7,308 $ 7,171 $ 2,041 Commercial real estate non-owner occupied 455 489 500 — Residential real estate 1,409 1,461 1,420 2 Consumer 1 3 1 — Total $ 8,460 $ 9,261 $ 9,092 $ 2,043 The following table summarizes the Company’s carrying value of non-accrual TDRs as of March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 Commercial $ 3,113 $ 5,808 Commercial real estate non-owner occupied 29 — Residential real estate 1,537 1,336 Consumer — 111 Total non-accruing TDRs $ 4,679 $ 7,255 At March 31, 2018 and December 31, 2017, the Company had $8.7 million and $8.5 million, respectively, of accruing TDRs that had been restructured from the original terms in order to facilitate repayment. Accrual of interest is resumed on loans that were on non-accrual only after the loan has performed sufficiently. The Company had one TDR that was modified within the past twelve months and had defaulted on its restructured terms during the three months ended March 31, 2018. The defaulted TDR consisted of one commercial real estate non-owner occupied loan totaling $0.2 million. Non-accruing TDRs decreased $2.6 million from December 31, 2017 due to one previously identified commercial and industrial loan of $2.3 million placed back on accrual during the period. The allowance for loan losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. During the three months ended March 31, 2017, the Company had one TDR that was modified within the past twelve months and had defaulted on its restructured terms. For purposes of this disclosure, the Company considers “default” to mean 90 days or more past due on principal or interest. Loans accounted for under ASC 310-30 Loan pools accounted for under ASC Topic 310-30 are periodically re-measured to determine expected future cash flows. In determining the expected cash flows, the timing of cash flows and prepayment assumptions for smaller homogeneous loans are based on statistical models that take into account factors such as the loan interest rate, credit profile of the borrowers, the years in which the loans were originated, and whether the loans are fixed or variable rate loans. Prepayments may be assumed on loans if circumstances specific to that loan warrant a prepayment assumption. The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the three months ended March 31, 2018 and 2017: March 31, 2018 March 31, 2017 Accretable yield beginning balance $ 46,568 $ 60,476 Reclassification from non-accretable difference 5,409 5,385 Reclassification to non-accretable difference (1,390) (399) Accretion (5,394) (5,871) Accretable yield ending balance $ 45,193 $ 59,591 Below is the composition of the net book value for loans accounted for under ASC 310-30 at March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 Contractual cash flows $ 488,637 $ 489,892 Non-accretable difference (331,135) (322,701) Accretable yield (45,193) (46,568) Loans accounted for under ASC 310-30 $ 112,309 $ 120,623

Allowance for Loan Losses

Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Allowance for Loan Losses	Note 6 Allowance for Loan Losses The tables below detail the Company’s allowance for loan losses and recorded investment in loans as of and for the three months ended March 31, 2018 and 2017: Three months ended March 31, 2018 Non-owner occupied commercial Residential Commercial real estate real estate Consumer Total Beginning balance $ 21,385 $ 5,609 $ 3,965 $ 305 $ 31,264 Originated and acquired beginning balance 21,340 5,583 3,965 305 31,193 Charge-offs (437) — — (279) (716) Recoveries 42 — 2 53 97 Provision 540 (712) (39) 211 — Originated and acquired ending balance 21,485 4,871 3,928 290 30,574 ASC 310-30 beginning balance 45 26 — — 71 Charge-offs — — — — — Recoveries — — — — — Provision (recoupment) 48 (7) — — 41 ASC 310-30 ending balance 93 19 — — 112 Ending balance $ 21,578 $ 4,890 $ 3,928 $ 290 $ 30,686 Ending allowance balance attributable to: Originated and acquired loans individually evaluated for impairment $ 1,185 $ 2 $ 31 $ — $ 1,218 Originated and acquired loans collectively evaluated for impairment 20,300 4,868 3,897 290 29,355 ASC 310-30 loans 93 20 — — 113 Total ending allowance balance $ 21,578 $ 4,890 $ 3,928 $ 290 $ 30,686 Loans: Originated and acquired loans individually evaluated for impairment $ 24,175 $ 1,901 $ 8,558 $ 38 $ 34,672 Originated and acquired loans collectively evaluated for impairment 2,057,022 633,537 838,597 26,197 3,555,353 ASC 310-30 loans 24,702 75,277 12,000 330 112,309 Total loans $ 2,105,899 $ 710,715 $ 859,155 $ 26,565 $ 3,702,334 Three months ended March 31, 2017 Non-owner occupied commercial Residential Commercial real estate real estate Consumer Total Beginning balance $ 18,821 $ 5,642 $ 4,387 $ 324 $ 29,174 Originated and acquired beginning balance 18,821 5,422 4,387 319 28,949 Charge-offs (20) — (8) (182) (210) Recoveries 11 10 3 67 91 Provision 1,727 167 (166) 72 1,800 Originated and acquired ending balance 20,539 5,599 4,216 276 30,630 ASC 310-30 beginning balance — 220 — 5 225 Charge-offs — — — — — Recoveries — — — — — Recoupment — (4) — (1) (5) ASC 310-30 ending balance — 216 — 4 220 Ending balance $ 20,539 $ 5,815 $ 4,216 $ 280 $ 30,850 Ending allowance balance attributable to: Originated and acquired loans individually evaluated for impairment $ 2,866 $ 1 $ 47 $ 2 $ 2,916 Originated and acquired loans collectively evaluated for impairment 17,673 5,598 4,169 274 27,714 ASC 310-30 loans — 216 — 4 220 Total ending allowance balance $ 20,539 $ 5,815 $ 4,216 $ 280 $ 30,850 Loans: Originated and acquired loans individually evaluated for impairment $ 31,946 $ 574 $ 8,403 $ 180 $ 41,103 Originated and acquired loans collectively evaluated for impairment 1,572,715 450,577 722,582 26,614 2,772,488 ASC 310-30 loans 36,935 86,842 15,470 817 140,064 Total loans $ 1,641,596 $ 537,993 $ 746,455 $ 27,611 $ 2,953,655 In evaluating the loan portfolio for an appropriate ALL level, non-impaired originated and acquired loans were grouped into segments based on broad characteristics such as primary use and underlying collateral. Within the segments, the portfolio was further disaggregated into classes of loans with similar attributes and risk characteristics for purposes of applying loss ratios and determining applicable subjective adjustments to the ALL. The application of subjective adjustments was based upon qualitative risk factors, including economic trends and conditions, industry conditions, asset quality, loss trends, lending management, portfolio growth and loan review/internal audit results. Net charge-offs on originated and acquired loans during the three months ended March 31, 2018 were $0.6 million. No provision was recorded for loan losses on originated and acquired loans during the three months ended March 31, 2018. During the three months ended March 31, 2017, the Company had $0.1 million of net charge offs on originated and acquired loans and recorded a provision for loan losses on originated and acquired loans of $1.8 million, driven by loan growth and increased reserves of $0.5 million for one energy sector credit previously placed on non-accrual. During the three months ended March 31, 2018 and 2017, the Company re-estimated the expected cash flows of the loan pools accounted for under ASC 310-30. The re-measurement during the three months ended March 31, 2018 resulted in a net provision of $41 thousand. The re-measurement during the three months ended March 31, 2017 resulted in a net recoupment of $5 thousand for the three months ended March 31, 2017.

Other Real Estate Owned

Other Real Estate Owned	3 Months Ended
	Mar. 31, 2018
FDIC Loss-Sharing Related
Other Real Estate Owned	Note 7 Other Real Estate Owned A summary of the activity in the OREO balances during the three months ended March 31, 2018 and 2017 is as follows: For the three months ended March 31, 2018 2017 Beginning balance $ 10,491 $ 15,662 Acquired through acquisition 1,409 — Transfers from loan portfolio, at fair value 127 578 Impairments (38) (46) Sales, net (114) (642) Ending balance $ 11,875 $ 15,552 The Company did not have any minority interest in participated other real estate owned at March 31, 2018. At December 31, 2017, OREO balances excluded $0.7 million of the Company’s minority interests in OREO, which are held by outside banks where the Company was not the lead bank and does not have a controlling interest. The Company maintains a receivable in other assets for these minority interests. Included in Sales, net are losses of $78 thousand for the three months ended March 31, 2018 and gains of $112 thousand for the three months ended March 31, 2017.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 8 Goodwill and Intangible Assets In connection with acquisitions, the Company recorded goodwill of $114.9 million, core deposit intangible assets of $48.8 million and mortgage servicing rights of $4.3 million. In connection with the acquisition of Peoples completed in the first quarter of 2018, the Company recorded goodwill of $55.3 million, core deposit intangibles assets of $10.5 million and mortgage servicing rights of $4.3 million. The goodwill is measured as the excess of the fair value of consideration paid over the fair value of assets acquired. No goodwill impairment was recorded during the three months ended March 31, 2018 or the year ended December 31, 2017. The Company is amortizing the core deposit intangibles from acquisitions on a straight line basis over 7-10 years from the date of the respective acquisitions, which represents the expected useful life of the assets. The Company recognized core deposit intangible amortization expense of $0.7 million and $1.4 million during the three months ended March 31, 2018 and 2017, respectively. Mortgage servicing rights represent rights to service loans originated by the Company and sold to government sponsored enterprises including Freddie Mac (FHLMC), Fannie Mae (FNMA), Ginnie Mae(GNMA) and Federal Home Loan Bank (FHLB). Mortgage loans serviced for others were $441.0 million at March 31, 2018. The gross carrying amount of intangible assets and the associated accumulated amortization at March 31, 2018 and December 31, 2017, are presented as follows: March 31, 2018 December 31, 2017 Gross Net Gross Net carrying Accumulated carrying carrying Accumulated carrying amount amortization amount amount amortization amount Core deposit intangible $ 48,834 $ 37,403 $ 11,431 $ 38,357 $ 36,750 $ 1,607 Mortgage servicing rights 4,301 171 4,130 — — — Total $ 53,135 $ 37,574 $ 15,561 $ 38,357 $ 36,750 $ 1,607 Below are the changes in the mortgage servicing rights for the periods presented: For the three months ended March 31, 2018 Beginning balance $ — Purchased through acquisitions 4,301 Amortization (171) Ending balance $ 4,130 Fair value of mortgage servicing rights $ 4,712 The Company is amortizing the mortgage servicing rights in proportion to and over the period of the estimated net servicing income of the underlying loans. The Company recognized mortgage servicing rights amortization expense of $0.2 million during the three months ended March 31, 2018. The fair value of mortgage servicing rights was determined based upon a discounted cash flow analysis. The cash flow analysis included assumptions for discount rates and prepayment speeds. Discount rates ranged from 9.5% to 10.5% and the constant prepayment speed ranged from 8.7% to 11.3% for the March 31, 2018 valuation. Mortgage servicing rights are evaluated for impairment and recognized through a valuation allowance to the extent fair value is less than the carrying amount. The Company evaluates impairment by type (FHLMC, FNMA, GNMA and FHLB) and interest rate. There is no valuation allowance at March 31, 2018.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2018
Disclosure of Repurchase Agreements [Abstract]
Borrowings	Note 9 Borrowings As of March 31, 2018 and December 31, 2017, the Company sold securities under agreements to repurchase totaling $141.2 million and $130.5 million, respectively, and none were for periods longer than one day. The Company pledged mortgage-backed securities with a fair value of approximately $166.3 million and $136.1 million as of March 31, 2018 and December 31, 2017, respectively, for these agreements. The Company monitors collateral levels on a continuous basis and may be required to provide additional collateral based on the fair value of the underlying securities. As of March 31, 2018 and December 31, 2017, the Company had $25.1 million and $5.7 million of excess collateral pledged for repurchase agreements. As a member of the FHLB, the Bank has access to a line of credit and term financing from the FHLB with total available credit of $847.9 million at March 31, 2018. At March 31, 2018 and December 31, 2017, the Bank had $77.3 million and $129.1 million in term advances from the FHLB, respectively. The term advances have fixed interest rates of 1.55%-2.33%, with maturity dates of 2018 - 2020. The Bank had investment securities pledged as collateral for FHLB advances in the amount of $27.8 million at March 31, 2018 and $28.1 million at December 31, 2017. Interest expense related to FHLB advances totaled $460 thousand and $197 thousand for the three months ended March 31, 2018 and 2017, respectively.

Regulatory Capital

Regulatory Capital	3 Months Ended
	Mar. 31, 2018
FDIC Loss-Sharing Related
Regulatory Capital	Note 10 Regulatory Capital As a bank holding company, the Company is subject to regulatory capital adequacy requirements implemented by the Federal Reserve. The federal banking agencies have risk-based capital adequacy regulations intended to provide a measure of capital adequacy that reflects the degree of risk associated with a banking organization’s operations. Under these regulations, assets are assigned to one of several risk categories, and nominal dollar amounts of assets and credit equivalent amounts of off-balance-sheet items are multiplied by a risk adjustment percentage for the category. The Basel III rules, effective January 1, 2016, changed the components of regulatory capital, changed the way in which risk ratings are assigned to various categories of bank assets and defined a new Tier 1 common risk-based ratio. In addition, a capital conservative buffer requirement, designed to strengthen an institution’s financial resilience during economic cycles through the restriction of capital distributions and other payments, became effective in 2017, with full phase-in beginning January 1, 2019. When fully phased-in, the capital conservation buffer adds a 2.5% capital requirement above existing regulatory minimum ratios. Under the Basel III requirements, at March 31, 2018 and December 31, 2017, the Company and the Bank met all capital requirements and the Bank had regulatory capital ratios in excess of the levels established for well-capitalized institutions, as detailed in the tables below. March 31, 2018 Required to be Required to be well capitalized under considered prompt corrective adequately Actual action provisions capitalized (1) Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: Consolidated $ 527,873 N/A N/A $ 220,218 NBH Bank 482,069 $ 273,067 218,454 Common equity tier 1 risk-based capital: Consolidated $ 527,873 N/A N/A $ 385,382 NBH Bank 482,069 $ 354,987 382,294 Tier 1 risk-based capital ratio: Consolidated $ 527,873 N/A N/A $ 361,114 NBH Bank 482,069 $ 338,103 359,234 Total risk-based capital ratio: Consolidated $ 559,623 N/A N/A $ 446,082 NBH Bank 513,819 $ 422,628 443,760 December 31, 2017 Required to be Required to be well capitalized under considered prompt corrective adequately Actual action provisions capitalized (1) Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: Consolidated $ 470,877 N/A N/A $ 191,559 NBH Bank 382,918 $ 237,772 190,217 Common equity tier 1 risk-based capital: Consolidated $ 470,877 N/A N/A $ 335,228 NBH Bank 382,918 $ 309,103 332,881 Tier 1 risk-based capital ratio: Consolidated $ 470,877 N/A N/A $ 309,400 NBH Bank 382,918 $ 289,022 307,086 Total risk-based capital ratio: Consolidated $ 502,917 N/A N/A $ 382,200 NBH Bank 414,958 $ 361,277 379,341 As of the fully phased-in date of January 1, 2019, including the capital conservation buffer.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2018
Revenue from Contracts with Customers
Revenue from Contracts with Customers	Note 11 Revenue from Contracts with Customers On January 1, 2018, the Company adopted ASU No. 2014-09 “Revenue from Contracts with Customers” (Topic 606) and all subsequent ASUs that modified Topic 606. As stated in Note 2, Recent A ccounting Pronouncements, the implementation of the new standard did not have a material impact on the measurement or recognition of revenue; as such, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts were not adjusted and continue to be reported in accordance with our historic accounting under Topic 605. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, and derivatives are also not in scope of the new guidance. Topic 606 is applicable to noninterest revenue streams such as deposit related fees, interchange fees, and merchant income. However, the recognition of these revenue streams did not change significantly upon adoption of Topic 606. Substantially all of the Company’s revenue is generated from contracts with customers. Noninterest revenue streams in-scope of Topic 606 are discussed below. Service Charges and other fees Service charge fees are primarily comprised of monthly service fees, check orders, and other deposit account related fees. Other fees include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. The Company’s performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Check orders and other deposit account related fees are largely transactional based, and therefore, the Company’s performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to clients’ accounts. Bank card fees Bank card fees are primarily comprised of debit card income, ATM fees, merchant services income, and other fees. Debit card income is primarily comprised of interchange fees earned whenever the Company’s debit cards are processed through card payment networks such as Visa. ATM fees are primarily generated when a Company cardholder uses a non-Company ATM or a non-Company cardholder uses a Company ATM. Merchant services income mainly represents fees charged to merchants to process their debit card transactions. The Company’s performance obligation for bank card fees are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Loss (gain) on OREO Sales, net Loss (gain) on OREO Sales, net is recognized when the Company meets its performance obligation to transfer title to the buyer. The gain or loss is measured as the excess of the proceeds received compared to the OREO carrying value. Sales proceeds are received in cash at the time of transfer. The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, and non-interest expense in-scope of Topic 606 for the three months ended March 31, 2018 and 2017. For the three months ended March 31, 2018 2017 Non-interest income In-scope of Topic 606: Service Charges and other fees $ 5,175 $ 3,791 Bank card fees 3,362 2,804 Non-interest income (in-scope of Topic 606) 8,537 6,595 Non-interest income (out-of-scope of Topic 606) 9,298 2,101 Total non-interest income $ 17,835 $ 8,696 Non-interest expense In-scope of Topic 606: Loss (gain) on OREO sales, net 78 (112) Total revenue in-scope of Topic 606 $ 8,615 $ 6,483 Contract Balances A contract asset balance occurs when an entity performs a service for a client before the client pays consideration (resulting in a contract receivable) or before payment is due (resulting in a contract asset). A contract liability balance is an entity’s obligation to transfer a service to a client for which the entity has already received payment (or payment is due) from the client. The Company’s noninterest revenue streams are largely based on transactional activity, or standard month-end revenue accruals. Consideration is often received immediately or shortly after the Company satisfies its performance obligation and revenue is recognized. The Company does not typically enter into long-term revenue contracts with clients, and therefore, does not experience significant contract balances. As of March 31, 2018 and December 31, 2017, the Company did not have any contract balances. Contract Acquisition Costs In connection with the adoption of Topic 606, an entity is required to capitalize, and subsequently amortize into expense, certain incremental costs of obtaining a contract with a customer if these costs are expected to be recovered. The incremental costs of obtaining a contract are those costs that an entity incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained (for example, sales commission). The Company utilizes the practical expedient which allows entities to immediately expense contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less. Upon adoption of Topic 606, the Company did not capitalize any contract acquisition cost.

Stock-based Compensation and Be

Stock-based Compensation and Benefits	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation and Benefits	Note 12 Stock-based Compensation and Benefits The Company provides stock-based compensation in accordance with shareholder-approved plans. During the second quarter of 2014, shareholders approved the 2014 Omnibus Incentive Plan (the "2014 Plan"). The 2014 Plan replaces the NBH Holdings Corp. 2009 Equity Incentive Plan (the "Prior Plan"), pursuant to which the Company granted equity awards prior to the approval of the 2014 Plan. Pursuant to the 2014 Plan, the Compensation Committee of the Board of Directors has the authority to grant, from time to time, awards of stock options, stock appreciation rights, restricted stock, restricted stock units, performance units, other stock-based awards, or any combination thereof to eligible persons. Stock options The Company issued stock options during the three months ended March 31, 2018 and 2017 in accordance with the 2014 Plan, which are time-vesting with 1/3 vesting on each of the first, second and third anniversary of the date of grant. The expense associated with the awarded stock options was measured at fair value using a Black-Scholes option-pricing model. The outstanding option awards vest on a graded basis over 1-4 years of continuous service and have 7-10 year contractual terms. The following table summarizes stock option activity for the three months ended March 31, 2018: Weighted average Weighted remaining average contractual Aggregate exercise term in intrinsic Options price years value Outstanding at December 31, 2017 1,598,318 $ 20.62 4.07 $ 19,017 Granted 148,198 32.74 Exercised (220,877) 19.74 Forfeited (9,595) 27.69 Outstanding at March 31, 2018 1,516,044 $ 21.89 4.38 $ 17,295 Options exercisable at March 31, 2018 1,152,875 $ 19.85 2.95 $ 15,450 Options vested and expected to vest 1,477,364 $ 21.64 4.24 $ 17,220 Stock option expense is a component of salaries and benefits in the consolidated statements of operations and totaled $0.2 million for the three months ended March 31, 2018 and 2017, respectively. At March 31, 2018, there was $1.2 million of total unrecognized compensation cost related to non-vested stock options granted under the plans. The cost is expected to be recognized over a weighted average period of 2.7 years. Restricted stock awards The Company issued time based restricted stock awards during the three months ended March 31, 2018 and 2017. The restricted stock awards vest over a range of a 1 - 3 year period. Restricted stock with time-based vesting was valued at the fair value of the shares on the date of grant as they are assumed to be held beyond the vesting period. No market-based stock awards were granted during the first quarter of 2018 or 2017. During the three months ended March 31, 2016, the Company granted market-based stock awards of 26,594 shares in accordance with the 2014 Plan. These shares have a five-year performance period and vest upon the later of the Company’s stock price achieving an established price goal during the performance period, and the third anniversary of the date of grant. The $11.28 per share fair value of these awards was determined using a Monte Carlo Simulation at grant date. The market-based performance condition had been met for these awards and the total unrecognized compensation cost related to non-vested market-based stock awards totaled $0.1 million, and is expected to be recognized over a weighted average period of approximately 0.9 years. Performance stock units During the three months ended March 31, 2018 and 2017, the Company granted 77,125 and 49,758 performance stock units in accordance with the 2014 Plan, respectively. These performance stock units granted represent initial target awards and do not reflect potential increases or decreases resulting from the final performance results, which are to be determined at the end of the three-year performance period (vesting date). The actual number of shares to be awarded at the end of the performance period will range from 0% - 150% of the initial target awards. 60% of the award is based on the Company’s cumulative earnings per share (EPS target) during the performance period, and 40% of the award is based on the Company’s cumulative total shareholder return (TSR target), or TSR, during the performance period. On the vesting date, the Company’s TSR will be compared to the respective TSRs of the companies comprising the KBW Regional Index at the grant date to determine the shares awarded. The fair value of the EPS target portion of the award was determined based on the closing stock price of the Company’s common stock on the grant date. The fair value of the TSR target portion of the award was determined using a Monte Carlo Simulation at the grant date. The weighted-average grant date fair value per unit for awards granted during the three months ended March 31, 2018 of the EPS target portion and the TSR target portion was $32.65 and $27.51, respectively. The following table summarizes restricted stock and performance stock unit activity during the three months ended March 31, 2018: Weighted Weighted Restricted average grant- Performance average grant- stock shares date fair value stock units date fair value Unvested at December 31, 2017 163,557 $ 22.60 125,082 $ 23.90 Granted 66,321 32.84 77,125 30.38 Vested (182) 18.48 — — Forfeited (7,914) 28.20 (5,351) 28.05 Unvested at March 31, 2018 221,782 $ 25.47 196,856 $ 26.33 As of March 31, 2018, the total unrecognized compensation cost related to the non-vested restricted stock awards and performance stock units totaled $2.5 million and $3.1 million, respectively, and is expected to be recognized over a weighted average period of approximately 2.6 years and 2.3 years, respectively. Expense related to non-vested restricted stock awards totaled $0.4 million and $0.6 million during the three months ended March 31, 2018 and 2017, respectively. Expense related to non-vested performance stock units totaled $0.2 million and $0.1 million during the three months ended March 31, 2018 and 2017, respectively. Expense related to non-vested restricted stock awards and units is a component of salaries and benefits in the Company’s consolidated statements of operations. Employee Stock Purchase Plan The 2014 Employee Stock Purchase Plan (“ESPP”) is intended to be a qualified plan within the meaning of Section 423 of the Internal Revenue Code of 1986 and allows eligible employees to purchase shares of common stock through payroll deductions up to a limit of $25,000 per calendar year and 2,000 shares per offering period. The price an employee pays for shares is 90.0% of the fair market value of Company common stock on the last day of the offering period. The offering periods are the six-month periods commencing on March 1 and September 1 of each year and ending on August 31 and February 28 (or February 29 in the case of a leap year) of each year. There are no vesting or other restrictions on the stock purchased by employees under the ESPP. Under the ESPP, the total number of shares of common stock reserved for issuance totaled 400,000 shares, of which 349,199 was available for issuance. Under the ESPP, employees purchased 5,960 shares and 5,373 shares during the three months ended March 31, 2018 and 2017, respectively.

Warrants

Warrants	3 Months Ended
	Mar. 31, 2018
Warrants and Rights Note Disclosure [Abstract]
Warrants	Note 13 Warrants During the first quarter of 2017, 250,750 warrants were exercised in a non-cash transaction, representing the remaining outstanding warrants. The warrants were granted to certain lead shareholders of the Company at the time of the Company’s initial capital raise (2009-2010), all with an exercise price of $20.00 per share. Refer to the consolidated statements of changes in shareholders’ equity for additional detail.

Common Stock

Common Stock	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Common Stock	Note 14 Common Stock The Company had 30,479,969 and 26,875,585 shares of Class A common stock outstanding at March 31, 2018 and December 31, 2017, respectively. Additionally, the Company had 221,782 and 163,557 shares outstanding at March 31, 2018 and December 31, 2017, respectively, of restricted Class A common stock issued but not yet vested under the 2014 Omnibus Incentive Plan and the Prior Plan that are not included in shares outstanding until such time that they are vested; however, these shares do have voting and certain dividend rights during the vesting period. On August 5, 2016, the Board of Directors authorized a new share repurchase program for up to $50.0 million from time to time in either the open market or through privately negotiated transactions. The remaining authorization under this program as of March 31, 2018 was $12.6 million.

Income Per Share

Income Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Income Per Share	Note 15 Income Per Share The Company calculates income per share under the two-class method, as certain non-vested share awards contain non-forfeitable rights to dividends. As such, these awards are considered securities that participate in the earnings of the Company. Non-vested shares are discussed further in note 12. The Company had 30,479,969 and 26,715,532 shares of Class A common stock outstanding as of March 31, 2018 and 2017, respectively, exclusive of issued non-vested restricted shares. Certain stock options and non-vested restricted shares are potentially dilutive securities, but are not included in the calculation of diluted income per share because to do so would have been anti-dilutive for the three months ended March 31, 2018 and 2017. The following table illustrates the computation of basic and diluted income per share for the three months ended March 31, 2018 and 2017: For the three months ended March 31, 2018 March 31, 2017 Net income $ 8,464 $ 8,258 Less: income allocated to participating securities (13) (8) Income allocated to common shareholders $ 8,451 $ 8,250 Weighted average shares outstanding for basic income per common share 30,493,689 26,801,773 Dilutive effect of equity awards 649,839 844,473 Dilutive effect of warrants — 33,783 Weighted average shares outstanding for diluted income per common share 31,143,528 27,680,029 Basic income per share $ 0.28 $ 0.31 Diluted income per share $ 0.27 $ 0.30 The Company had 1,516,044 and 1,719,701 outstanding stock options to purchase common stock at weighted average exercise prices of $21.89 and $20.56 per share at March 31, 2018 and 2017, respectively, which have time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those stock options is dilutive. Additionally, 250,750 warrants were exercised in a non-cash transaction during the first quarter of 2017, representing the remaining outstanding warrants to purchase shares of the Company’s common stock. The warrants had an exercise price of $20.00. The Company had 418,638 and 490,528 unvested restricted shares and units issued as of March 31, 2018 and 2017, respectively, which have performance, market and/or time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those restricted shares and units is dilutive.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 16 Income Taxes Income tax expense attributable to income before income taxes was $1.7 million for the three months ended March 31, 2018 compared to an income tax benefit of $(1.2) million for the three month ended March 31, 2017, calculated based on a full year forecast method, resulting in an effective income tax rate of 16.7% for the three months ended March 31, 2018 and an effective income tax benefit of (17.7)% for the three months ended March 31, 2017. The tax expense recorded for the three months ended March 31, 2018 and March 31, 2017 was lowered by a $0.4 million and $2.8 million discrete tax benefit from stock compensation activity during the respective periods. The quarterly tax rate differs from the federal statutory rate primarily due to tax benefits from stock compensation activity, interest income from tax-exempt lending, bank-owned life insurance income, and the relationship of these items to pre-tax income. See management’s discussion and analysis for further information.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Note 17 Derivatives Risk management objective of using derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company has established policies that neither carrying value nor fair value at risk should exceed established guidelines. The Company has designed strategies to confine these risks within the established limits and identify appropriate trade-offs in the financial structure of its balance sheet. These strategies include the use of derivative financial instruments to help achieve the desired balance sheet repricing structure while meeting the desired objectives of its clients. Currently, the Company employs certain interest rate swaps that are designated as fair value hedges as well as economic hedges. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions. Fair values of derivative instruments on the balance sheet The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the consolidated statements of financial condition as of March 31, 2018 and December 31, 2017. Information about the valuation methods used to measure fair value is provided in note 19. Asset derivatives fair value Liability derivatives fair value Balance Sheet March 31, December 31, Balance Sheet March 31, December 31, location 2018 2017 location 2018 2017 Derivatives designated as hedging instruments: Interest rate products Other assets $ 21,496 $ 10,489 Other liabilities $ 121 $ 1,167 Total derivatives designated as hedging instruments $ 21,496 $ 10,489 $ 121 $ 1,167 Derivatives not designated as hedging instruments: Interest rate products Other assets $ 3,199 $ 2,483 Other liabilities $ 3,179 $ 2,584 Interest rate lock commitments Other assets 1,219 128 Other liabilities 312 — Forward contracts Other assets 97 5 Other liabilities 289 7 Total derivatives not designated as hedging instruments $ 4,515 $ 2,616 $ 3,780 $ 2,591 Fair value hedges Interest rate swaps designated as fair value hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. As of March 31, 2018, the Company had interest rate swaps with a notional amount of $462.9 million that were designated as fair value hedges of interest rate risk associated with $507.8 million of the Company’s fixed-rate loans, included in loans receivable on the statements of financial condition, before a $(20.5) million fair value hedge adjustment in the carrying amount. As of December 31, 2017, the Company had interest rate swaps with a notional amount of $417.7 million that were designated as fair value hedges. For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in earnings. The Company includes the gain or loss on the hedged items in the same line item as the offsetting loss or gain on the related derivatives. Non-designated hedges Derivatives not designated as hedges are not speculative and consist of interest rate swaps with commercial banking clients that facilitate their respective risk management strategies. Interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the client swaps and the offsetting swaps are recognized directly in earnings. As of March 31, 2018, the Company had matched interest rate swap transactions with an aggregate notional amount of $184.0 million related to this program. As of December 31, 2017, the Company had matched interest rate swap transactions with an aggregate notional amount of $202.2 million related to this program. As part of its mortgage banking activities, the Company enters into interest rate lock commitments, which are commitments to originate loans where the interest rate on the loan is determined prior to funding and the clients have locked into that interest rate. The Company then locks in the loan and interest rate with an investor and commits to deliver the loan if settlement occurs ("best efforts") or commits to deliver the locked loan in a binding ("mandatory") delivery program with an investor. Fair value changes of certain loans under interest rate lock commitments are hedged with forward sales contracts of MBS. Forward sales contracts of MBS are recorded at fair value with changes in fair value recorded in non-interest income. Interest rate lock commitments and commitments to deliver loans to investors are considered derivatives. The market value of interest rate lock commitments and best efforts contracts are not readily ascertainable with precision because they are not actively traded in stand-alone markets. The Company determines the fair value of interest rate lock commitments and delivery contracts by measuring the fair value of the underlying asset, which is impacted by current interest rates, taking into consideration the probability that the interest rate lock commitments will close or will be funded. Certain additional risks arise from these forward delivery contracts in that the counterparties to the contracts may not be able to meet the terms of the contracts. The Company does not expect any counterparty to any MBS contract to fail to meet its obligation. Additional risks inherent in mandatory delivery programs include the risk that, if the Company fails to deliver the loans subject to interest rate risk lock commitments, it will still be obligated to “pair off” MBS to the counterparty. Should this be required, the Company could incur significant costs in acquiring replacement loans and such costs could have an adverse effect on the consolidated financial statements. The fair value of the mortgage banking derivative is recorded as a freestanding asset or liability with the change in value being recognized in current earnings during the period of change. The Company had interest rate lock commitments with a notional value of $110.7 million and forward contracts with a notional value of $131.4 million at March 31, 2018. At December 31, 2017, the Company had interest rate lock commitments with a notional value of $8.0 million and forward contracts with a notional value of $9.0 million. Effect of derivative instruments on the consolidated statements of operations The tables below present the effect of the Company’s derivative financial instruments in the consolidated statements of operations for the three months ended March 31, 2018 and 2017: Location of gain (loss) Amount of gain or (loss) recognized in income on derivatives Derivatives in fair value recognized in income on For the three months ended March 31, hedging relationships derivatives 2018 2017 Interest rate products Interest and fees on loans $ 12,052 $ — Interest rate products Other non-interest income — 1,064 Total $ 12,052 $ 1,064 Location of gain (loss) Amount of gain or (loss) recognized in income on hedged items recognized in income on For the three months ended March 31, Hedged items hedged items 2018 2017 Interest rate products Interest and fees on loans $ (11,917) $ — Interest rate products Other non-interest income — (1,241) Total $ (11,917) $ (1,241) Location of gain (loss) Amount of gain or (loss) recognized in income on derivatives Derivatives not designated recognized in income on For the three months ended March 31, as hedging instruments derivatives 2018 2017 Interest rate products Other non-interest expense $ 122 $ (32) Interest rate lock commitments Mortgage banking income 375 123 Forward contracts Mortgage banking income 1,108 (193) Total $ 1,605 $ (102) Credit-risk-related contingent features The Company has agreements with its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness for reasons other than an error or omission of an administrative or operational nature, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well/adequately capitalized institution, then the counterparty has the right to terminate the derivative positions and the Company would be required to settle its obligations under the agreements. As of March 31, 2018, the termination value of derivatives in a net liability position related to these agreements was $3.3 million, which includes accrued interest but excludes any adjustment for nonperformance risk. The Company has minimum collateral posting thresholds with certain of its derivative counterparties and as of March 31, 2018 the Company had posted $0.2 million in eligible collateral. If the Company had breached any of these provisions at March 31, 2018, it could have been required to settle its obligations under the agreements at the termination value.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 18 Commitments and Contingencies In the normal course of business, the Company enters into various off-balance sheet commitments to help meet the financing needs of clients. These financial instruments include commitments to extend credit, commercial and consumer lines of credit and standby letters of credit. The same credit policies are applied to these commitments as the loans on the consolidated statements of financial condition; however, these commitments involve varying degrees of credit risk in excess of the amount recognized in the consolidated statements of financial condition. At March 31, 2018 and December 31, 2017, the Company had loan commitments totaling $786.9 million and $680.8 million, respectively, and standby letters of credit that totaled $8.1 million and $7.2 million, respectively. The total amounts of unused commitments do not necessarily represent future credit exposure or cash requirements, as commitments often expire without being drawn upon. However, the contractual amount of these commitments, offset by any additional collateral pledged, represents the Company’s potential credit loss exposure. Total unfunded commitments at March 31, 2018 and December 31, 2017 were as follows: March 31, 2018 December 31, 2017 Commitments to fund loans $ 235,078 $ 181,904 Unfunded commitments under lines of credit 551,838 498,857 Commercial and standby letters of credit 8,143 7,185 Total unfunded commitments $ 795,059 $ 687,946 Commitments to fund loans —Commitments to fund loans are legally binding agreements to lend to clients in accordance with predetermined contractual provisions providing there have been no violations of any conditions specified in the contract. These commitments are generally at variable interest rates and are for specific periods or contain termination clauses and may require the payment of a fee. The total amounts of unused commitments are not necessarily representative of future credit exposure or cash requirements, as commitments often expire without being drawn upon. Unfunded commitments under lines of credit —In the ordinary course of business, the Company extends revolving credit to its clients. These arrangements may require the payment of a fee. Commercial and standby letters of credit —As a provider of financial services, the Company routinely issues commercial and standby letters of credit, which may be financial standby letters of credit or performance standby letters of credit. These are various forms of “back-up” commitments to guarantee the performance of a client to a third party. While these arrangements represent a potential cash outlay for the Company, the majority of these letters of credit will expire without being drawn upon. Letters of credit are subject to the same underwriting and credit approval process as traditional loans, and as such, many of them have various forms of collateral securing the commitment, which may include real estate, personal property, receivables or marketable securities. Mortgage loans sold to investors may be subject to repurchase or indemnification in the event of specific default by the borrower or subsequent discovery that underwriting standards were not met. The Company established a reserve liability for expected losses related to these representations and warranties based upon management’s evaluation of actual and historic loss history, delinquency trends in the portfolio and economic conditions. The Company recorded a repurchase reserve of $4.3 million at March 31, 2018, which is included in other liabilities on the consolidated statements of financial condition. Contingencies In the ordinary course of business, the Company and the Bank may be subject to litigation. Based upon the available information and advice from the Company’s legal counsel, management does not believe that any potential, threatened or pending litigation to which it is a party will have a material adverse effect on the Company’s liquidity, financial condition or results of operations.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 19 Fair Value Measurements The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For disclosure purposes, the Company groups its financial and non-financial assets and liabilities into three different levels based on the nature of the instrument and the availability and reliability of the information that is used to determine fair value. The three levels are defined as follows: · Level 1—Includes assets or liabilities in which the inputs to the valuation methodologies are based on unadjusted quoted prices in active markets for identical assets or liabilities. · Level 2—Includes assets or liabilities in which the inputs to the valuation methodologies are based on similar assets or liabilities in inactive markets, quoted prices for identical or similar assets or liabilities in inactive markets, and inputs other than quoted prices that are observable, such as interest rates, yield curves, volatilities, prepayment speeds, and other inputs obtained from observable market input. · Level 3—Includes assets or liabilities in which the inputs to the valuation methodology are based on at least one significant assumption that is not observable in the marketplace. These valuations may rely on management’s judgment and may include internally-developed model-based valuation techniques. Level 1 inputs are considered to be the most transparent and reliable and level 3 inputs are considered to be the least transparent and reliable. The Company assumes the use of the principal market to conduct a transaction of each particular asset or liability being measured and then considers the assumptions that market participants would use when pricing the asset or liability. Whenever possible, the Company first looks for quoted prices for identical assets or liabilities in active markets (level 1 inputs) to value each asset or liability. However, when inputs from identical assets or liabilities on active markets are not available, the Company utilizes market observable data for similar assets and liabilities. The Company maximizes the use of observable inputs and limits the use of unobservable inputs to occasions when observable inputs are not available. The need to use unobservable inputs generally results from the lack of market liquidity of the actual financial instrument or of the underlying collateral. Although, in some instances, third party price indications may be available, limited trading activity can challenge the observability of these quotations. Changes in the valuation inputs used for measuring the fair value of financial instruments may occur due to changes in current market conditions or other factors. Such changes may necessitate a transfer of the financial instruments to another level in the hierarchy based on the new inputs used. The Company recognizes these transfers at the end of the reporting period that the transfer occurs. During the three months ended March 31, 2018 and 2017, there were no transfers of financial instruments between the hierarchy levels. The following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of each instrument under the valuation hierarchy: Fair Value of Financial Instruments Measured on a Recurring Basis Investment securities available-for-sale —Investment securities available-for-sale are carried at fair value on a recurring basis. To the extent possible, observable quoted prices in an active market are used to determine fair value and, as such, these securities are classified as level 1. At March 31, 2018 and December 31, 2017, the Company did not hold any level 1 securities. When quoted market prices in active markets for identical assets or liabilities are not available, quoted prices of securities with similar characteristics, discounted cash flows or other pricing characteristics are used to estimate fair values and the securities are then classified as level 2. Loans held for sale —The Company has elected to record loans originated and intended for sale in the secondary market at estimated fair value. The portfolio consists primarily of fixed rate residential mortgage loans that are sold within 45 days. The Company estimates fair value based on quoted market prices for similar loans in the secondary market and is classifies as Level 2. Interest rate swap derivatives —The Company's derivative instruments are limited to interest rate swaps that may be accounted for as fair value hedges or non-designated hedges. The fair values of the swaps incorporate credit valuation adjustments in order to appropriately reflect nonperformance risk in the fair value measurements. The credit valuation adjustment is the dollar amount of the fair value adjustment related to credit risk and utilizes a probability weighted calculation to quantify the potential loss over the life of the trade. The credit valuation adjustments are calculated by determining the total expected exposure of the derivatives (which incorporates both the current and potential future exposure) and then applying the respective counterparties’ credit spreads to the exposure offset by marketable collateral posted, if any. Certain derivative transactions are executed with counterparties who are large financial institutions ("dealers"). International Swaps and Derivative Association Master Agreements ("ISDA") and Credit Support Annexes ("CSA") are employed for all contracts with dealers. These contracts contain bilateral collateral arrangements. The fair value inputs of these financial instruments are determined using discounted cash flow analysis through the use of third-party models whose significant inputs are readily observable market parameters, primarily yield curves, with appropriate adjustments for liquidity and credit risk, and are classified as level 2. Mortgage banking derivatives —The Company relies on a third-party pricing service to value its mortgage banking derivative financial assets and liabilities, which the Company classifies as a level 3 valuation. The external valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups. The Company also relies on an external valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Company would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing. The tables below present the financial instruments measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 on the consolidated statements of financial condition utilizing the hierarchy structure described above: March 31, 2018 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ 188,630 $ — $ 188,630 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 727,729 — 727,729 Municipal securities — 818 — 818 Loans held for sale — 51,050 — 51,050 Interest rate swap derivatives — 24,695 — 24,695 Mortgage banking derivatives — — 1,316 1,316 Total assets at fair value $ — $ 992,922 $ 1,316 $ 994,238 Liabilities: Interest rate swap derivatives $ — $ 3,300 $ — $ 3,300 Mortgage banking derivatives — — 601 Total liabilities at fair value $ — $ 3,300 $ 601 $ 3,901 December 31, 2017 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ 168,648 $ — $ 168,648 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 685,230 — 685,230 Municipal securities — 829 — 829 Loans held for sale — 4,629 — 4,629 Interest rate swap derivatives — 12,972 — 12,972 Mortgage banking derivatives — — 133 Total assets at fair value $ — $ 872,308 $ 133 $ 872,441 Liabilities: Interest rate swap derivatives $ — $ 3,751 $ — $ 3,751 Mortgage banking derivatives — — 7 Total liabilities at fair value $ — $ 3,751 $ 7 $ 3,758 The table below details the changes in level 3 financial instruments during the three months ended March 31, 2018: Mortgage banking derivatives, net Balance at December 31, 2017 $ 126 Gain included in earnings, net 589 Balance at March 31, 2018 $ Fair Value of Financial Instruments Measured on a Non-recurring Basis Certain assets may be recorded at fair value on a non-recurring basis as conditions warrant. These non-recurring fair value measurements typically result from the application of lower of cost or fair value accounting or a write-down occurring during the period. The Company records collateral dependent loans that are considered to be impaired at their estimated fair value. A loan is considered impaired when it is probable that the Company will be unable to collect all contractual amounts due in accordance with the terms of the loan agreement. Collateral dependent impaired loans are measured based on the fair value of the collateral. The Company relies on third-party appraisals and internal assessments, utilizing a discount rate in the range of 0% - 25%, in determining the estimated fair values of these loans. The inputs used to determine the fair values of loans are considered level 3 inputs in the fair value hierarchy. At March 31, 2018, the Company measured six originated and acquired loans at fair value on a non-recurring basis, with a carrying balance of $6.4 million and specific reserve balance of $1.2 million. At March 31, 2017, the Company measured three loans with a carrying balance of $10.6 million and specific reserve balance of $2.9 million. OREO is recorded at the lower of the cost basis or the fair value of the collateral less estimated selling costs. The estimated fair values of OREO are updated periodically and further write-downs may be taken to reflect a new basis. The Company recognized $38 thousand and $46 thousand of OREO impairments in its consolidated statements of operations during the three months ended March 31, 2018 and 2017, respectively. The fair values of OREO are derived from third party price opinions or appraisals that generally use an income approach or a market value approach. If reasonable comparable appraisals are not available, then the Company may use internally developed models to determine fair values. The inputs used to determine the fair values of OREO are considered level 3 inputs in the fair value hierarchy. M ortgage servicing rights represent the value associated with servicing residential real estate loans that have been sold to outside investors with servicing retained. The fair value for servicing assets is determined through discounted cash flow analysis and utilizes discount rates ranging from 9.5% to 10.5% at March 31, 2018 and prepayment speed assumption ranges of 8.7% to 11.3% at March 31, 2018 as inputs. Mortgage servicing rights are subject to impairment testing. The carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value. For purposes of measuring impairment, the rights are stratified into certain risk characteristics including note type and note term. If the valuation model reflects a value less than the carrying value, mortgage servicing rights are adjusted to fair value through a valuation allowance. There was no valuation allowance recorded at March 31, 2018. The inputs used to determine the fair values of mortgage servicing rights are considered level 3 inputs in the fair value hierarchy. The Company may be required to record fair value adjustments on other available-for-sale and municipal securities valued at par on a non-recurring basis. The tables below provide information regarding the assets recorded at fair value on a non-recurring basis during the three months ended March 31, 2018 and 2017: March 31, 2018 Total Losses from fair value changes Other real estate owned $ 11,875 $ 38 Impaired loans 34,672 715 March 31, 2017 Total Losses from fair value changes Other real estate owned $ 15,552 $ 46 Impaired loans 41,103 209 The Company did not record any liabilities measured at fair value on a non-recurring basis during the three months ended March 31, 2018.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 20 Fair Value of Financial Instruments The fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction in the principal market at the measurement date under current market conditions. The fair value of the financial instruments listed below does not reflect a premium or discount that could result from offering all of the Company’s holdings of financial instruments at one time, nor does it reflect the underlying value of the Company, as ASC Topic 825 excludes certain financial instruments and all non-financial instruments from its disclosure requirements. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies and are based on the exit price notion set forth by ASU 2016-01 effective January 1, 2018 and applied to this disclosure on a prospective basis. Considerable judgment is required to interpret market data in order to develop the estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize in a current market exchange. The fair value of financial instruments at March 31, 2018 and December 31, 2017, including methods and assumptions utilized for determining fair value of financial instruments, are set forth below: Level in fair value March 31, 2018 December 31, 2017 measurement Carrying Estimated Carrying Estimated hierarchy amount fair value amount fair value ASSETS Cash and cash equivalents Level 1 $ 286,870 $ 286,870 $ 257,364 $ 257,364 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 188,630 188,630 168,648 168,648 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 727,729 727,729 685,230 685,230 Municipal securities Level 2 818 818 829 829 Municipal securities Level 3 219 219 219 219 Other available-for-sale securities Level 3 469 469 419 419 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 191,136 188,609 204,352 204,048 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 92,233 90,107 54,378 52,723 Non-marketable securities Level 2 14,088 14,088 15,030 15,030 Loans receivable Level 3 3,702,334 3,670,007 3,178,947 3,167,508 Loans held for sale Level 2 51,050 51,050 4,629 4,629 Accrued interest receivable Level 2 18,343 18,343 14,255 14,255 Interest rate swap derivatives Level 2 24,695 24,695 12,972 12,972 Mortgage banking derivatives Level 3 1,316 1,316 133 133 LIABILITIES Deposit transaction accounts Level 2 3,561,858 3,561,858 2,861,509 2,861,509 Time deposits Level 2 1,147,452 1,147,452 1,118,050 1,118,050 Securities sold under agreements to repurchase Level 2 141,187 141,187 130,463 130,463 Federal Home Loan Bank advances Level 2 77,335 77,647 129,115 130,300 Accrued interest payable Level 2 7,198 7,198 5,776 5,776 Interest rate swap derivatives Level 2 3,300 3,300 3,751 3,751 Mortgage banking derivatives Level 3 7 7

Acquisition Activities - (Table

Acquisition Activities - (Tables) 10Q	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Net Assets acquired (at fair value) and consideration transferred	The table below summarizes the net assets acquired (at fair value) and consideration transferred in connection with the Peoples acquisition: Assets: Cash and due from banks $ 105,173 Investment securities available-for-sale 118,512 Non-marketable securities 4,796 Loans 542,707 Loans held for sale 54,260 Other real estate owned 1,409 Premises and equipment 18,584 Core deposit intangible asset 10,477 Mortgage servicing rights 4,301 Other assets 15,324 Total assets acquired $ 875,543 Liabilities: Total deposits 729,911 FHLB borrowings 33,825 Other liabilities 20,683 Total liabilities assumed $ 784,419 Identifiable net assets acquired $ 91,124 Consideration: NBHC common stock paid at January 1, 2018, closing price of $32.43 $ 110,213 Cash 36,189 Total $ 146,402 Estimated goodwill created $ 55,278

Investment Securities - (Tables

Investment Securities - (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	At March 31, 2018 and December 31, 2017, the Company held $0.9 billion of available-for-sale investment securities. Available-for-sale securities are summarized as follows as of the dates indicated: March 31, 2018 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 189,430 $ 1,635 $ (2,435) $ 188,630 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 751,497 151 (23,919) 727,729 Municipal securities 1,054 — (17) 1,037 Other securities 469 — — 469 Total investment securities available-for-sale $ 942,450 $ 1,786 $ (26,371) $ 917,865 December 31, 2017 Amortized Gross Gross cost unrealized gains unrealized losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 167,269 $ 2,371 $ (992) $ 168,648 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 702,107 351 (17,228) 685,230 Municipal securities 1,054 — (6) 1,048 Other securities 419 — — 419 Total investment securities available-for-sale $ 870,849 $ 2,722 $ (18,226) $ 855,345
Summary of unrealized losses for available-for-sale securities	The tables below summarize the available-for-sale securities with unrealized losses as of the dates shown, along with the length of the impairment period: March 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 99,713 $ (1,579) $ 32,040 $ (856) $ 131,753 $ (2,435) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 274,644 (3,894) 385,797 (20,025) 660,441 (23,919) Municipal securities 503 (17) — — 503 (17) Total $ 374,860 $ (5,490) $ 417,837 $ (20,881) $ 792,697 $ (26,371) December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 62,178 $ (408) $ 36,086 $ (584) $ 98,264 $ (992) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 162,346 (830) 412,967 (16,398) 575,313 (17,228) Municipal securities 514 (6) — — 514 (6) Total $ 225,038 $ (1,244) $ 449,053 $ (16,982) $ 674,091 $ (18,226)
Held-to-maturity Securities	Held-to-maturity investment securities are summarized as follows as of the dates indicated: March 31, 2018 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 191,136 $ 8 $ (2,535) $ 188,609 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 92,233 5 (2,131) 90,107 Total investment securities held-to-maturity $ 283,369 $ 13 $ (4,666) $ 278,716 December 31, 2017 Gross Gross Amortized unrealized unrealized cost gains losses Fair value Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 204,352 $ 151 $ (455) $ 204,048 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 54,378 — (1,655) 52,723 Total investment securities held-to-maturity $ 258,730 $ 151 $ (2,110) $ 256,771
Summary of unrealized losses for held-to-maturity securities	The tables below summarize the held-to-maturity securities with unrealized losses as of the dates shown, along with the length of the impairment period: March 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 171,017 $ (2,059) $ 16,202 $ (476) $ 187,219 $ (2,535) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 6,018 (139) 43,350 (1,992) 49,368 (2,131) Total $ 177,035 $ (2,198) $ 59,552 $ (2,468) $ 236,587 $ (4,666) December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized value losses value losses value losses Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ 149,182 $ (220) $ 17,506 $ (235) $ 166,688 $ (455) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises 6,460 (65) 46,264 (1,590) 52,724 (1,655) Total $ 155,642 $ (285) $ 63,770 $ (1,825) $ 219,412 $ (2,110)

Loans - (Tables)

Loans - (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30 and Loans Covered by the FDIC Loss Sharing Agreements	The carrying value of originated and acquired loans is net of discounts, fees, cost and fair value marks of $11.2 million and $4.3 million as of March 31, 2018 and December 31, 2017, respectively. March 31, 2018 ASC Originated and 310-30 loans acquired loans Total loans % of total Commercial $ 24,702 $ 2,081,197 $ 2,105,899 Commercial real estate non-owner occupied 75,277 635,438 710,715 Residential real estate 12,000 847,155 859,155 Consumer 330 26,235 26,565 Total $ 112,309 $ 3,590,025 $ 3,702,334 December 31, 2017 ASC Originated and 310-30 loans acquired loans Total loans % of total Commercial $ 29,475 $ 1,845,130 $ 1,874,605 Commercial real estate non-owner occupied 77,908 485,141 563,049 Residential real estate 12,759 703,478 716,237 Consumer 481 24,575 25,056 Total $ 120,623 $ 3,058,324 $ 3,178,947
Past Due Financing Receivables	Delinquency for originated and acquired loans is shown in the following tables at March 31, 2018 and December 31, 2017: March 31, 2018 Greater Total Loans > 90 30-59 60-89 than 90 originated and days past days past days past days past Total past acquired due and Non- due due due due Current loans still accruing accrual Originated and acquired loans: Commercial: Commercial and industrial $ 1,083 $ 116 $ 1,214 $ 2,413 $ 1,492,675 $ 1,495,088 $ 150 $ 5,302 Owner occupied commercial real estate 440 534 2,790 3,764 380,483 384,247 535 7,202 Agriculture 151 — 734 885 160,764 161,649 16 2,103 Energy — — 923 923 39,290 40,213 — 923 Total commercial 1,674 650 5,661 7,985 2,073,212 2,081,197 701 15,530 Commercial real estate non-owner occupied: Construction 465 941 642 2,048 110,038 112,086 642 — Acquisition/development — — 51 51 23,058 23,109 51 833 Multifamily — — 29 29 51,712 51,741 — 29 Non-owner occupied — 10 — 10 448,492 448,502 — 613 Total commercial real estate 465 951 722 2,138 633,300 635,438 693 1,475 Residential real estate: Senior lien 2,535 309 1,517 4,361 744,083 748,444 238 5,918 Junior lien 1,002 238 40 1,280 97,431 98,711 — 710 Total residential real estate 3,537 547 1,557 5,641 841,514 847,155 238 6,628 Consumer 204 22 140 366 25,869 26,235 135 36 Total originated and acquired loans $ 5,880 $ 2,170 $ 8,080 $ 16,130 $ 3,573,895 $ 3,590,025 $ 1,767 $ 23,669 December 31, 2017 Greater Total Loans > 90 30-59 60-89 than 90 originated and days past days past days past days past Total past acquired due and Non- due due due due Current loans still accruing accrual Originated and acquired loans: Commercial: Commercial and industrial $ 554 $ 117 $ 1,389 $ 2,060 $ 1,373,962 $ 1,376,022 $ 150 $ 7,767 Owner occupied commercial real estate 696 — 1,983 2,679 270,074 272,753 — 3,478 Agriculture 585 — 701 1,286 137,609 138,895 — 2,003 Energy — — 1,645 1,645 55,815 57,460 — 1,645 Total commercial 1,835 117 5,718 7,670 1,837,460 1,845,130 150 14,893 Commercial real estate non-owner occupied: Construction — — 179 179 107,502 107,681 — 179 Acquisition/development 1,097 — — 1,097 13,318 14,415 — — Multifamily — — — — 26,947 26,947 — — Non-owner occupied 56 — 574 630 335,468 336,098 — 605 Total commercial real estate 1,153 — 753 1,906 483,235 485,141 — 784 Residential real estate: Senior lien 1,167 885 1,396 3,448 643,034 646,482 — 4,724 Junior lien 233 91 41 365 56,631 56,996 — 459 Total residential real estate 1,400 976 1,437 3,813 699,665 703,478 — 5,183 Consumer 157 6 5 168 24,407 24,575 — 140 Total originated and acquired loans $ 4,545 $ 1,099 $ 7,913 $ 13,557 $ 3,044,767 $ 3,058,324 $ 150 $ 21,000
Schedule Of Impaired Financing Receivable With And Without Related Allowance	Additional information regarding impaired loans at March 31, 2018 and December 31, 2017 is set forth in the table below: March 31, 2018 December 31, 2017 Allowance Allowance Unpaid for loan Unpaid for loan principal Recorded losses principal Recorded losses balance investment allocated balance investment allocated With no related allowance recorded: Commercial: Commercial and industrial $ 7,036 $ 5,562 $ — $ 6,481 $ 5,055 $ — Owner occupied commercial real estate 7,726 7,464 — 4,186 3,934 — Agriculture 1,508 1,259 — 1,502 1,245 — Energy 6,889 2,171 — 8,661 3,861 — Total commercial 23,159 16,456 — 20,830 14,095 — Commercial real estate non-owner occupied: Construction — — — 215 179 — Acquisition/development 1,065 833 — — — — Multifamily 29 29 — 29 29 — Non-owner occupied 962 845 — 901 853 — Total commercial real estate 2,056 1,707 — 1,145 1,061 — Residential real estate: Senior lien 1,738 1,563 — 333 309 — Junior lien 393 300 — — — — Total residential real estate 2,131 1,863 — 333 309 — Consumer 42 39 — — — — Total impaired loans with no related allowance recorded $ 27,388 $ 20,065 $ — $ 22,308 $ 15,465 $ — With a related allowance recorded: Commercial: Commercial and industrial $ 6,884 $ 4,284 $ 906 $ 7,919 $ 5,339 $ 1,329 Owner occupied commercial real estate 1,421 1,253 78 873 713 4 Agriculture 2,225 2,182 201 2,122 2,083 133 Energy — — — — — — Total commercial 10,530 7,719 1,185 10,914 8,135 1,466 Commercial real estate non-owner occupied: Construction — — — — — — Acquisition/development — — — — — — Multifamily — — — — — — Non-owner occupied 200 193 1 207 200 1 Total commercial real estate 200 193 1 207 200 1 Residential real estate: Senior lien 6,329 5,553 24 6,481 5,753 24 Junior lien 1,262 1,142 7 1,295 1,179 8 Total residential real estate 7,591 6,695 31 7,776 6,932 32 Consumer — — — 146 141 1 Total impaired loans with a related allowance recorded $ 18,321 $ 14,607 $ 1,217 $ 19,043 $ 15,408 $ 1,500 Total impaired loans $ 45,709 $ 34,672 $ 1,217 $ 41,351 $ 30,873 $ 1,500
Schedule of Impaired Financing Receivable, Average Recorded Investment and Interest Income Recognized	The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the periods presented: For the three months ended March 31, 2018 March 31, 2017 Average Interest Average Interest With no related allowance recorded: Commercial: Commercial and industrial $ 5,534 $ 83 $ 8,095 $ 48 Owner occupied commercial real estate 7,487 18 3,885 18 Agriculture 1,259 6 2,588 — Energy 2,353 20 6,098 — Total commercial 16,633 127 20,666 66 Commercial real estate non-owner occupied: Construction — — — — Acquisition/development 886 — — — Multifamily — — — — Non-owner occupied 876 4 329 7 Total commercial real estate 1,762 4 329 7 Residential real estate: Senior lien 1,612 — 1,047 3 Junior lien 305 — — — Total residential real estate 1,917 — 1,047 3 Consumer 14 — 4 — Total impaired loans with no related allowance recorded $ 20,326 $ 131 $ 22,046 $ 76 With a related allowance recorded: Commercial: Commercial and industrial $ 4,339 $ — $ 3,445 $ — Owner occupied commercial real estate 1,265 5 678 5 Agriculture 2,126 1 156 1 Energy — — 6,589 — Total commercial 7,730 6 10,868 6 Commercial real estate non-owner occupied: Construction — — — — Acquisition/development — — — — Multifamily 29 — 32 — Non-owner occupied 196 2 223 3 Total commercial real estate 225 2 255 3 Residential real estate: Senior lien 5,601 13 5,791 21 Junior lien 1,151 9 1,625 13 Total residential real estate 6,752 22 7,416 34 Consumer 24 — 181 — Total impaired loans with a related allowance recorded $ 14,731 $ 30 $ 18,720 $ 43 Total impaired loans $ 35,057 $ 161 $ 40,766 $ 119
Additional Information Related to Accruing TDR's	The tables below provide additional information related to accruing TDRs at March 31, 2018 and December 31, 2017: March 31, 2018 Recorded Average year-to-date Unpaid Unfunded commitments investment recorded investment principal balance to fund TDRs Commercial $ 7,045 $ 6,985 $ 7,832 $ 1,902 Commercial real estate non-owner occupied 426 431 471 — Residential real estate 1,205 1,213 1,214 2 Consumer — — — — Total $ 8,676 $ 8,629 $ 9,517 $ 1,904 December 31, 2017 Recorded Average year-to-date Unpaid Unfunded commitments investment recorded investment principal balance to fund TDRs Commercial $ 6,595 $ 7,308 $ 7,171 $ 2,041 Commercial real estate non-owner occupied 455 489 500 — Residential real estate 1,409 1,461 1,420 2 Consumer 1 3 1 — Total $ 8,460 $ 9,261 $ 9,092 $ 2,043
Re-Measurement of Loans Accounted for Under ASC Topic 310-30 Resulting in Changes in Carrying Amount of Accretable Yield	The re-measurement of loans accounted for under ASC 310-30 resulted in the following changes in the carrying amount of accretable yield during the three months ended March 31, 2018 and 2017: March 31, 2018 March 31, 2017 Accretable yield beginning balance $ 46,568 $ 60,476 Reclassification from non-accretable difference 5,409 5,385 Reclassification to non-accretable difference (1,390) (399) Accretion (5,394) (5,871) Accretable yield ending balance $ 45,193 $ 59,591
Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30	Below is the composition of the net book value for loans accounted for under ASC 310-30 at March 31, 2018 and December 31, 2017: March 31, 2018 December 31, 2017 Contractual cash flows $ 488,637 $ 489,892 Non-accretable difference (331,135) (322,701) Accretable yield (45,193) (46,568) Loans accounted for under ASC 310-30 $ 112,309 $ 120,623

Allowance for Loan Losses - (Ta

Allowance for Loan Losses - (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Summary of Company's Allowance for Loan Losses ("ALL") and Recorded Investment in Loans	The tables below detail the Company’s allowance for loan losses and recorded investment in loans as of and for the three months ended March 31, 2018 and 2017: Three months ended March 31, 2018 Non-owner occupied commercial Residential Commercial real estate real estate Consumer Total Beginning balance $ 21,385 $ 5,609 $ 3,965 $ 305 $ 31,264 Originated and acquired beginning balance 21,340 5,583 3,965 305 31,193 Charge-offs (437) — — (279) (716) Recoveries 42 — 2 53 97 Provision 540 (712) (39) 211 — Originated and acquired ending balance 21,485 4,871 3,928 290 30,574 ASC 310-30 beginning balance 45 26 — — 71 Charge-offs — — — — — Recoveries — — — — — Provision (recoupment) 48 (7) — — 41 ASC 310-30 ending balance 93 19 — — 112 Ending balance $ 21,578 $ 4,890 $ 3,928 $ 290 $ 30,686 Ending allowance balance attributable to: Originated and acquired loans individually evaluated for impairment $ 1,185 $ 2 $ 31 $ — $ 1,218 Originated and acquired loans collectively evaluated for impairment 20,300 4,868 3,897 290 29,355 ASC 310-30 loans 93 20 — — 113 Total ending allowance balance $ 21,578 $ 4,890 $ 3,928 $ 290 $ 30,686 Loans: Originated and acquired loans individually evaluated for impairment $ 24,175 $ 1,901 $ 8,558 $ 38 $ 34,672 Originated and acquired loans collectively evaluated for impairment 2,057,022 633,537 838,597 26,197 3,555,353 ASC 310-30 loans 24,702 75,277 12,000 330 112,309 Total loans $ 2,105,899 $ 710,715 $ 859,155 $ 26,565 $ 3,702,334 Three months ended March 31, 2017 Non-owner occupied commercial Residential Commercial real estate real estate Consumer Total Beginning balance $ 18,821 $ 5,642 $ 4,387 $ 324 $ 29,174 Originated and acquired beginning balance 18,821 5,422 4,387 319 28,949 Charge-offs (20) — (8) (182) (210) Recoveries 11 10 3 67 91 Provision 1,727 167 (166) 72 1,800 Originated and acquired ending balance 20,539 5,599 4,216 276 30,630 ASC 310-30 beginning balance — 220 — 5 225 Charge-offs — — — — — Recoveries — — — — — Recoupment — (4) — (1) (5) ASC 310-30 ending balance — 216 — 4 220 Ending balance $ 20,539 $ 5,815 $ 4,216 $ 280 $ 30,850 Ending allowance balance attributable to: Originated and acquired loans individually evaluated for impairment $ 2,866 $ 1 $ 47 $ 2 $ 2,916 Originated and acquired loans collectively evaluated for impairment 17,673 5,598 4,169 274 27,714 ASC 310-30 loans — 216 — 4 220 Total ending allowance balance $ 20,539 $ 5,815 $ 4,216 $ 280 $ 30,850 Loans: Originated and acquired loans individually evaluated for impairment $ 31,946 $ 574 $ 8,403 $ 180 $ 41,103 Originated and acquired loans collectively evaluated for impairment 1,572,715 450,577 722,582 26,614 2,772,488 ASC 310-30 loans 36,935 86,842 15,470 817 140,064 Total loans $ 1,641,596 $ 537,993 $ 746,455 $ 27,611 $ 2,953,655

Other Real Estate Owned - (Tabl

Other Real Estate Owned - (Tables)	3 Months Ended
	Mar. 31, 2018
FDIC Loss-Sharing Related
Summary of Activity in OREO Balances	A summary of the activity in the OREO balances during the three months ended March 31, 2018 and 2017 is as follows: For the three months ended March 31, 2018 2017 Beginning balance $ 10,491 $ 15,662 Acquired through acquisition 1,409 — Transfers from loan portfolio, at fair value 127 578 Impairments (38) (46) Sales, net (114) (642) Ending balance $ 11,875 $ 15,552

Goodwill and Intangible Assets

Goodwill and Intangible Assets - (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of gross carrying amount of intangible assets and the associated accumulated amortization	The gross carrying amount of intangible assets and the associated accumulated amortization at March 31, 2018 and December 31, 2017, are presented as follows: March 31, 2018 December 31, 2017 Gross Net Gross Net carrying Accumulated carrying carrying Accumulated carrying amount amortization amount amount amortization amount Core deposit intangible $ 48,834 $ 37,403 $ 11,431 $ 38,357 $ 36,750 $ 1,607 Mortgage servicing rights 4,301 171 4,130 — — — Total $ 53,135 $ 37,574 $ 15,561 $ 38,357 $ 36,750 $ 1,607
Summary of changes in the mortgage servicing rights	Below are the changes in the mortgage servicing rights for the periods presented: For the three months ended March 31, 2018 Beginning balance $ — Purchased through acquisitions 4,301 Amortization (171) Ending balance $ 4,130 Fair value of mortgage servicing rights $ 4,712

Regulatory Capital - (Tables)

Regulatory Capital - (Tables)	3 Months Ended
	Mar. 31, 2018
FDIC Loss-Sharing Related
Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements	March 31, 2018 Required to be Required to be well capitalized under considered prompt corrective adequately Actual action provisions capitalized (1) Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: Consolidated $ 527,873 N/A N/A $ 220,218 NBH Bank 482,069 $ 273,067 218,454 Common equity tier 1 risk-based capital: Consolidated $ 527,873 N/A N/A $ 385,382 NBH Bank 482,069 $ 354,987 382,294 Tier 1 risk-based capital ratio: Consolidated $ 527,873 N/A N/A $ 361,114 NBH Bank 482,069 $ 338,103 359,234 Total risk-based capital ratio: Consolidated $ 559,623 N/A N/A $ 446,082 NBH Bank 513,819 $ 422,628 443,760 December 31, 2017 Required to be Required to be well capitalized under considered prompt corrective adequately Actual action provisions capitalized (1) Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: Consolidated $ 470,877 N/A N/A $ 191,559 NBH Bank 382,918 $ 237,772 190,217 Common equity tier 1 risk-based capital: Consolidated $ 470,877 N/A N/A $ 335,228 NBH Bank 382,918 $ 309,103 332,881 Tier 1 risk-based capital ratio: Consolidated $ 470,877 N/A N/A $ 309,400 NBH Bank 382,918 $ 289,022 307,086 Total risk-based capital ratio: Consolidated $ 502,917 N/A N/A $ 382,200 NBH Bank 414,958 $ 361,277 379,341 As of the fully phased-in date of January 1, 2019, including the capital conservation buffer.

Revenue from Contracts with C37

Revenue from Contracts with Customers - (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contracts with Customers
Summary of non-interest income segregated by revenue streams	The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, and non-interest expense in-scope of Topic 606 for the three months ended March 31, 2018 and 2017. For the three months ended March 31, 2018 2017 Non-interest income In-scope of Topic 606: Service Charges and other fees $ 5,175 $ 3,791 Bank card fees 3,362 2,804 Non-interest income (in-scope of Topic 606) 8,537 6,595 Non-interest income (out-of-scope of Topic 606) 9,298 2,101 Total non-interest income $ 17,835 $ 8,696 Non-interest expense In-scope of Topic 606: Loss (gain) on OREO sales, net 78 (112) Total revenue in-scope of Topic 606 $ 8,615 $ 6,483

Stock-based Compensation and 38

Stock-based Compensation and Benefits - (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity	The following table summarizes stock option activity for the three months ended March 31, 2018: Weighted average Weighted remaining average contractual Aggregate exercise term in intrinsic Options price years value Outstanding at December 31, 2017 1,598,318 $ 20.62 4.07 $ 19,017 Granted 148,198 32.74 Exercised (220,877) 19.74 Forfeited (9,595) 27.69 Outstanding at March 31, 2018 1,516,044 $ 21.89 4.38 $ 17,295 Options exercisable at March 31, 2018 1,152,875 $ 19.85 2.95 $ 15,450 Options vested and expected to vest 1,477,364 $ 21.64 4.24 $ 17,220
Summary of Restricted Stock Activity	The following table summarizes restricted stock and performance stock unit activity during the three months ended March 31, 2018: Weighted Weighted Restricted average grant- Performance average grant- stock shares date fair value stock units date fair value Unvested at December 31, 2017 163,557 $ 22.60 125,082 $ 23.90 Granted 66,321 32.84 77,125 30.38 Vested (182) 18.48 — — Forfeited (7,914) 28.20 (5,351) 28.05 Unvested at March 31, 2018 221,782 $ 25.47 196,856 $ 26.33

Income Per Share - (Tables)

Income Per Share - (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Income (Loss) Per Share	The following table illustrates the computation of basic and diluted income per share for the three months ended March 31, 2018 and 2017: For the three months ended March 31, 2018 March 31, 2017 Net income $ 8,464 $ 8,258 Less: income allocated to participating securities (13) (8) Income allocated to common shareholders $ 8,451 $ 8,250 Weighted average shares outstanding for basic income per common share 30,493,689 26,801,773 Dilutive effect of equity awards 649,839 844,473 Dilutive effect of warrants — 33,783 Weighted average shares outstanding for diluted income per common share 31,143,528 27,680,029 Basic income per share $ 0.28 $ 0.31 Diluted income per share $ 0.27 $ 0.30

Derivatives - (Tables)

Derivatives - (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Information about the valuation methods used to measure fair value is provided in note 19. Asset derivatives fair value Liability derivatives fair value Balance Sheet March 31, December 31, Balance Sheet March 31, December 31, location 2018 2017 location 2018 2017 Derivatives designated as hedging instruments: Interest rate products Other assets $ 21,496 $ 10,489 Other liabilities $ 121 $ 1,167 Total derivatives designated as hedging instruments $ 21,496 $ 10,489 $ 121 $ 1,167 Derivatives not designated as hedging instruments: Interest rate products Other assets $ 3,199 $ 2,483 Other liabilities $ 3,179 $ 2,584 Interest rate lock commitments Other assets 1,219 128 Other liabilities 312 — Forward contracts Other assets 97 5 Other liabilities 289 7 Total derivatives not designated as hedging instruments $ 4,515 $ 2,616 $ 3,780 $ 2,591
Derivative Instruments, Gain (Loss)	The tables below present the effect of the Company’s derivative financial instruments in the consolidated statements of operations for the three months ended March 31, 2018 and 2017: Location of gain (loss) Amount of gain or (loss) recognized in income on derivatives Derivatives in fair value recognized in income on For the three months ended March 31, hedging relationships derivatives 2018 2017 Interest rate products Interest and fees on loans $ 12,052 $ — Interest rate products Other non-interest income — 1,064 Total $ 12,052 $ 1,064 Location of gain (loss) Amount of gain or (loss) recognized in income on hedged items recognized in income on For the three months ended March 31, Hedged items hedged items 2018 2017 Interest rate products Interest and fees on loans $ (11,917) $ — Interest rate products Other non-interest income — (1,241) Total $ (11,917) $ (1,241) Location of gain (loss) Amount of gain or (loss) recognized in income on derivatives Derivatives not designated recognized in income on For the three months ended March 31, as hedging instruments derivatives 2018 2017 Interest rate products Other non-interest expense $ 122 $ (32) Interest rate lock commitments Mortgage banking income 375 123 Forward contracts Mortgage banking income 1,108 (193) Total $ 1,605 $ (102)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Total Unfunded Commitments	Total unfunded commitments at March 31, 2018 and December 31, 2017 were as follows: March 31, 2018 December 31, 2017 Commitments to fund loans $ 235,078 $ 181,904 Unfunded commitments under lines of credit 551,838 498,857 Commercial and standby letters of credit 8,143 7,185 Total unfunded commitments $ 795,059 $ 687,946

Fair Value Measurements - (Tabl

Fair Value Measurements - (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Tables of Financial Instruments Measured At Fair Value on Recurring Basis	The tables below present the financial instruments measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 on the consolidated statements of financial condition utilizing the hierarchy structure described above: March 31, 2018 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ 188,630 $ — $ 188,630 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 727,729 — 727,729 Municipal securities — 818 — 818 Loans held for sale — 51,050 — 51,050 Interest rate swap derivatives — 24,695 — 24,695 Mortgage banking derivatives — — 1,316 1,316 Total assets at fair value $ — $ 992,922 $ 1,316 $ 994,238 Liabilities: Interest rate swap derivatives $ — $ 3,300 $ — $ 3,300 Mortgage banking derivatives — — 601 Total liabilities at fair value $ — $ 3,300 $ 601 $ 3,901 December 31, 2017 Level 1 Level 2 Level 3 Total Assets: Investment securities available-for-sale: Mortgage-backed securities (“MBS”): Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises $ — $ 168,648 $ — $ 168,648 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises — 685,230 — 685,230 Municipal securities — 829 — 829 Loans held for sale — 4,629 — 4,629 Interest rate swap derivatives — 12,972 — 12,972 Mortgage banking derivatives — — 133 Total assets at fair value $ — $ 872,308 $ 133 $ 872,441 Liabilities: Interest rate swap derivatives $ — $ 3,751 $ — $ 3,751 Mortgage banking derivatives — — 7 Total liabilities at fair value $ — $ 3,751 $ 7 $ 3,758
Table of Changes in Level 3 Financial Instruments	The table below details the changes in level 3 financial instruments during the three months ended March 31, 2018: Mortgage banking derivatives, net Balance at December 31, 2017 $ 126 Gain included in earnings, net 589 Balance at March 31, 2018 $
Table of assets recorded at fair value on a non-recurring basis	The tables below provide information regarding the assets recorded at fair value on a non-recurring basis during the three months ended March 31, 2018 and 2017: March 31, 2018 Total Losses from fair value changes Other real estate owned $ 11,875 $ 38 Impaired loans 34,672 715 March 31, 2017 Total Losses from fair value changes Other real estate owned $ 15,552 $ 46 Impaired loans 41,103 209

Fair Value of Financial Instr43

Fair Value of Financial Instruments - (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	The fair value of financial instruments at March 31, 2018 and December 31, 2017, including methods and assumptions utilized for determining fair value of financial instruments, are set forth below: Level in fair value March 31, 2018 December 31, 2017 measurement Carrying Estimated Carrying Estimated hierarchy amount fair value amount fair value ASSETS Cash and cash equivalents Level 1 $ 286,870 $ 286,870 $ 257,364 $ 257,364 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 188,630 188,630 168,648 168,648 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 727,729 727,729 685,230 685,230 Municipal securities Level 2 818 818 829 829 Municipal securities Level 3 219 219 219 219 Other available-for-sale securities Level 3 469 469 419 419 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 191,136 188,609 204,352 204,048 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 92,233 90,107 54,378 52,723 Non-marketable securities Level 2 14,088 14,088 15,030 15,030 Loans receivable Level 3 3,702,334 3,670,007 3,178,947 3,167,508 Loans held for sale Level 2 51,050 51,050 4,629 4,629 Accrued interest receivable Level 2 18,343 18,343 14,255 14,255 Interest rate swap derivatives Level 2 24,695 24,695 12,972 12,972 Mortgage banking derivatives Level 3 1,316 1,316 133 133 LIABILITIES Deposit transaction accounts Level 2 3,561,858 3,561,858 2,861,509 2,861,509 Time deposits Level 2 1,147,452 1,147,452 1,118,050 1,118,050 Securities sold under agreements to repurchase Level 2 141,187 141,187 130,463 130,463 Federal Home Loan Bank advances Level 2 77,335 77,647 129,115 130,300 Accrued interest payable Level 2 7,198 7,198 5,776 5,776 Interest rate swap derivatives Level 2 3,300 3,300 3,751 3,751 Mortgage banking derivatives Level 3 7 7

Basis of Presentation - (Detail

Basis of Presentation - (Details)	3 Months Ended
	Mar. 31, 2018item
Accounting Policies [Abstract]
Number of full service banking offices	104

Acquisition Activities - (Narra

Acquisition Activities - (Narrative) (Details)10Q - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Acquisition related expenses	$ 7,600	$ 7,600
Amortization and accretion of purchase discounts and premiums	(821)	(703)
Pro forma information
Total revenue	65,500	61,600
Net income	$ 14,500	$ 9,900
Basic earnings per share (in dollars per share)	$ 0.48	$ 0.33
Diluted earnings per share (in dollars per share)	$ 0.47	$ 0.32
Peoples Ince Member
Business Acquisition [Line Items]
Gross contractual amounts receivable	$ 713,600
Loans not expected to be collected	$ 6,100
Amortization and accretion of purchase discounts and premiums		$ 200
Amortization of acquired identifiable intangibles		$ 300

Acquisition - (Summary of Net A

Acquisition - (Summary of Net Assets Acquired) (Details) 10Q - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2018	Dec. 31, 2017
Consideration:
Goodwill		$ 114,909	$ 59,630
Core Deposits
Assets:
Intangible asset		48,800
Mortgage servicing rights
Assets:
Intangible asset		4,300
Peoples Inc Member
Assets:
Cash and due from banks	$ 105,173
Investment secruities available-for-sale (at fair value)	118,512
Non-marketable securities	4,796
Loans, net	542,707
Loans held for sale	54,260
Other real estate owned	1,409
Premises and equipment, net	18,584
Other assets	15,324
Total assets aquired	875,543
Liabilities:
Total deposits	729,911
FHLB borrowings	33,825
Other liabilities	20,683
Total liabilities assumed	784,419
Identifiable net assets acquired	91,124
Consideration:
Cash	36,189
Common stock paid	110,213
Total Consideration	146,402
Goodwill	55,278	55,300
Peoples Inc Member | Core Deposits
Assets:
Intangible asset	10,477	10,500
Peoples Inc Member | Mortgage servicing rights
Assets:
Intangible asset	$ 4,301	$ 4,300

Acquisition Activities (Details

Acquisition Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 01, 2018	Jan. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Jan. 31, 2017
Subsequent Event [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		3,398,477
Business Acquisition, Share Price					$ 32.43
Business Acquisition Restricted Cash				$ 10,000
Amortization of accretion of purchase discounts			$ (821)	(703)
Business Acquisition, Pro Forma Revenue			65,500	61,600
Business Acquisition, Pro Forma Net Income (Loss)			$ 14,500	$ 9,900
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ 0.48	$ 0.33
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ 0.47	$ 0.32
Peoples Inc. Member
Subsequent Event [Line Items]
Mortgage repurchase reserve	$ 4,000

Investment Securities - (Narrat

Investment Securities - (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)security	Dec. 31, 2017USD ($)security
Investment securities total	$ 1,200,000	$ 1,100,000
Amortized cost	942,450	870,849
Available-for-sale securities	917,865	855,345
Held-to-maturity securities	$ 283,369	$ 258,730
Mortgage-backed securities as percentage of available-for-sale investment portfolio	100.00%	100.00%
Number of securities | security	205	87
Fair value of available-for-sale securities in an unrealized loss position	$ 792,697	$ 674,091
Fair value of available-for-sale investment securities pledged as collateral	$ 427,800	$ 334,600
Estimated weighted average life of the available-for-sale mortgage-backed securities portfolio	3 years 6 months	3 years 4 months 24 days
Life of the available-for-sale mortgage-backed securities portfolio	3 years 1 month 6 days	3 years 1 month 6 days
Other securities having no contractual maturity date	$ 800
Number of held-to-maturity securities in unrealized loss positions | security	48	36
Fair value of held-to-maturity securities in an unrealized loss position	$ 236,587	$ 219,412
Held-to-maturity investment securities pledged as collateral	$ 140,800	$ 142,000
Estimated weighted average expected life of the held-to-maturity mortgage-backed securities portfolio	3 years 1 month 6 days	3 years 1 month 6 days
Life of the held-to-maturity investment portfolio	2 years 7 months 6 days	2 years 9 months 18 days
Municipal securities maturing within one to five years [Member]
Amortized cost	$ 200
Available-for-sale securities	200
Municipal securities due within five to ten years [Member]
Amortized cost	500
Available-for-sale securities	500
Other Securities [Member]
Amortized cost	469	$ 419
Available-for-sale securities	$ 469	$ 419

Investment Securities - (Summar

Investment Securities - (Summary of Available-for-Sale Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 942,450	$ 870,849
Gross unrealized gains	1,786	2,722
Gross unrealized losses	(26,371)	(18,226)
Investment securities available-for-sale (at fair value)	917,865	855,345
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	189,430	167,269
Gross unrealized gains	1,635	2,371
Gross unrealized losses	(2,435)	(992)
Investment securities available-for-sale (at fair value)	188,630	168,648
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	751,497	702,107
Gross unrealized gains	151	351
Gross unrealized losses	(23,919)	(17,228)
Investment securities available-for-sale (at fair value)	727,729	685,230
Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,054	1,054
Gross unrealized losses	(17)	(6)
Investment securities available-for-sale (at fair value)	1,037	1,048
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	469	419
Investment securities available-for-sale (at fair value)	$ 469	$ 419

Investment Securities - (Summ50

Investment Securities - (Summary of Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 374,860	$ 225,038
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5,490)	(1,244)
12 months or more, Fair Value	417,837	449,053
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(20,881)	(16,982)
Total, Fair Value	792,697	674,091
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(26,371)	(18,226)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	99,713	62,178
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,579)	(408)
12 months or more, Fair Value	32,040	36,086
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(856)	(584)
Total, Fair Value	131,753	98,264
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,435)	(992)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	274,644	162,346
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,894)	(830)
12 months or more, Fair Value	385,797	412,967
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(20,025)	(16,398)
Total, Fair Value	660,441	575,313
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(23,919)	(17,228)
Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	503	514
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(17)	(6)
Total, Fair Value	503	514
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (17)	$ (6)

Investment Securities - (Summ51

Investment Securities - (Summary of Held-to-maturity Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	$ 283,369	$ 258,730
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	13	151
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(4,666)	(2,110)
Fair value	278,716	256,771
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	191,136	204,352
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	8	151
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(2,535)	(455)
Fair value	188,609	204,048
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	92,233	54,378
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(2,131)	(1,655)
Fair value	$ 90,107	$ 52,723

Investment Securities - (Summ52

Investment Securities - (Summary of Held-to-Maturity Securities, Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	$ 177,035	$ 155,642
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,198)	(285)
Fair Value, 12 months or more	59,552	63,770
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,468)	(1,825)
Total Fair Value	236,587	219,412
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(4,666)	(2,110)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	171,017	149,182
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,059)	(220)
Fair Value, 12 months or more	16,202	17,506
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(476)	(235)
Total Fair Value	187,219	166,688
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,535)	(455)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	6,018	6,460
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(139)	(65)
Fair Value, 12 months or more	43,350	46,264
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,992)	(1,590)
Total Fair Value	49,368	52,724
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2,131)	$ (1,655)

Loans - Narrative Section (Deta

Loans - Narrative Section (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Fees and cost related to loans	$ 11,200		$ 4,300
Carrying amount of loan investments	3,702,334	$ 2,953,655	3,178,947
Increase in Non Accrual from acquisition	5,700
Commercial and Industrial [Member]
Debt Instrument [Line Items]
Loans Placed on Accrual	2,300
Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,105,899		1,874,605
Non Accrual [Member]
Debt Instrument [Line Items]
Recorded investment, non-accrual status	23,700
Increase (decrease) in non-accrual loans	$ 2,700
Percentage increase (decrease) in past due loans	12.70%
Originated and acquired loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 3,590,025		3,058,324
Allowance for Loan and Lease Losses, Write-offs	716	210
Originated and acquired loans [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,081,197		1,845,130
ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	112,309	$ 140,064	120,623
ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	24,702		29,475
Substandard [Member] | Originated and acquired loans [Member]
Debt Instrument [Line Items]
Increase (decrease) in carrying amount of loan investments	14,200
Special Mention [Member] | Originated and acquired loans [Member]
Debt Instrument [Line Items]
Increase (decrease) in carrying amount of loan investments	15,300
Total Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	3,702,334		3,178,947
Total Loans [Member] | Originated and acquired loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	3,590,025		3,058,324
Recorded investment, non-accrual status	23,669		21,000
Total past due loans	16,130		13,557
Total Loans [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	1,495,088		1,376,022
Recorded investment, non-accrual status	5,302		7,767
Total past due loans	2,413		2,060
Total Loans [Member] | Originated and acquired loans [Member] | Energy Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	40,213		57,460
Recorded investment, non-accrual status	923		1,645
Total past due loans	923		1,645
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,081,197		1,845,130
Recorded investment, non-accrual status	15,530		14,893
Total past due loans	7,985		7,670
Total Loans [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	384,247		272,753
Recorded investment, non-accrual status	7,202		3,478
Total past due loans	3,764		2,679
Total Loans [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	448,502		336,098
Recorded investment, non-accrual status	613		605
Total past due loans	10		630
Total Loans [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	112,309		120,623
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	24,702		29,475
Total Loans [Member] | Substandard [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	79,523		66,329
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	47,815		33,613
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	20,219		14,824
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Energy Loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	923		1,646
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	33,192		23,764
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	10,148		5,424
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,932		1,477
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	31,708		32,716
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	3,783		4,451
Total Loans [Member] | Special Mention [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	66,518		51,188
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	63,451		48,171
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	13,070		10,829
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	42,050		46,683
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	25,493		17,030
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	15,133		1,396
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	3,067		3,017
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	1,073		1,070
Total Loans [Member] | Doubtful [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	1,177		1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	1,177		1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	903		1,253
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	1,177		1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 73		$ 75

Loans - Impaired Loans Narrativ

Loans - Impaired Loans Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)loanitem	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)
Debt Instrument [Line Items]
Carrying amount of loan investments	$ 3,702,334	$ 3,178,947	$ 2,953,655
Impaired loans	14,900
Recorded investment of impaired loans	$ 34,672	30,873
Number of loans resulting in increase to impaired loans | loan	7
Collective related allowance for loan losses for impaired loans	$ 1,217	1,500
Non Accrual [Member]
Debt Instrument [Line Items]
Investment in impaired loans not covered by loan loss, non-accrual status	23,700
Fair Value Of Collateral Pledged [Member]
Debt Instrument [Line Items]
Impaired loans	17,900
Discounted Cash Flows [Member]
Debt Instrument [Line Items]
Impaired loans	2,300
General Reserve [Member]
Debt Instrument [Line Items]
Impaired loans	8,700
Individual loan amount of impaired loans	250
Commercial Loan [Member]
Debt Instrument [Line Items]
Carrying amount of loan investments	2,105,899	$ 1,874,605
Commercial and Industrial [Member]
Debt Instrument [Line Items]
Impaired loans	$ 7,500
Number of loans resulting in increase to impaired loans | item	3
Energy Loans [Member]
Debt Instrument [Line Items]
Number of loans resulting in increase to impaired loans | item	1
Agricultural Sector [Member]
Debt Instrument [Line Items]
Impaired loans	$ 1,200
Number of loans resulting in increase to impaired loans | item	1
Owner-Occupied [Member]
Debt Instrument [Line Items]
Impaired loans	$ 4,900

Loans - (Loan Portfolio Composi

Loans - (Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Loans [Line Items]
Total Loans	$ 3,702,334	$ 3,178,947	$ 2,953,655
% of Total	100.00%	100.00%
Commercial Loan [Member]
Loans [Line Items]
Total Loans	$ 2,105,899	$ 1,874,605
% of Total	56.90%	59.00%
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	$ 710,715	$ 563,049
% of Total	19.20%	17.70%
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	$ 859,155	$ 716,237
% of Total	23.20%	22.50%
Consumer [Member]
Loans [Line Items]
Total Loans	$ 26,565	$ 25,056
% of Total	0.70%	0.80%
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	$ 112,309	$ 120,623	$ 140,064
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	24,702	29,475
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	75,277	77,908
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	12,000	12,759
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	330	481
Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	3,590,025	3,058,324
Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	2,081,197	1,845,130
Originated and acquired loans [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	635,438	485,141
Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	847,155	703,478
Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	$ 26,235	$ 24,575

Loans - (Loan Delinquency) (Det

Loans - (Loan Delinquency) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Loans [Line Items]
Total loans	$ 3,702,334	$ 3,178,947	$ 2,953,655
Commercial Loan [Member]
Loans [Line Items]
Total loans	2,105,899	1,874,605
Commercial Real Estate [Member]
Loans [Line Items]
Total loans	710,715	563,049
Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	859,155	716,237
Consumer [Member]
Loans [Line Items]
Total loans	26,565	25,056
Originated and acquired loans [Member]
Loans [Line Items]
Total loans	3,590,025	3,058,324
Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	2,081,197	1,845,130
Originated and acquired loans [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	635,438	485,141
Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	847,155	703,478
Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total loans	26,235	24,575
ASC 310-30 [Member]
Loans [Line Items]
Total loans	112,309	120,623	$ 140,064
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	24,702	29,475
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	75,277	77,908
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	12,000	12,759
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	330	481
Total Loans [Member]
Loans [Line Items]
Total loans	3,702,334	3,178,947
Total Loans [Member] | Originated and acquired loans [Member]
Loans [Line Items]
Total past due loans	16,130	13,557
Current	3,573,895	3,044,767
Total loans	3,590,025	3,058,324
Loans 90 days past due and still accruing	1,767	150
Non- accrual	23,669	21,000
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans	2,048	179
Current	110,038	107,502
Total loans	112,086	107,681
Loans 90 days past due and still accruing	642
Non- accrual		179
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total past due loans	51	1,097
Current	23,058	13,318
Total loans	23,109	14,415
Loans 90 days past due and still accruing	51
Non- accrual	833
Total Loans [Member] | Originated and acquired loans [Member] | Multifamily [Member]
Loans [Line Items]
Total past due loans	29
Current	51,712	26,947
Total loans	51,741	26,947
Non- accrual	29
Total Loans [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	2,413	2,060
Current	1,492,675	1,373,962
Total loans	1,495,088	1,376,022
Loans 90 days past due and still accruing	150	150
Non- accrual	5,302	7,767
Total Loans [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	3,764	2,679
Current	380,483	270,074
Total loans	384,247	272,753
Loans 90 days past due and still accruing	535
Non- accrual	7,202	3,478
Total Loans [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	10	630
Current	448,492	335,468
Total loans	448,502	336,098
Non- accrual	613	605
Total Loans [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans	2,138	1,906
Current	633,300	483,235
Total loans	635,438	485,141
Loans 90 days past due and still accruing	693
Non- accrual	1,475	784
Total Loans [Member] | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total past due loans	4,361	3,448
Current	744,083	643,034
Total loans	748,444	646,482
Loans 90 days past due and still accruing	238
Non- accrual	5,918	4,724
Total Loans [Member] | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total past due loans	1,280	365
Current	97,431	56,631
Total loans	98,711	56,996
Non- accrual	710	459
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	7,985	7,670
Current	2,073,212	1,837,460
Total loans	2,081,197	1,845,130
Loans 90 days past due and still accruing	701	150
Non- accrual	15,530	14,893
Total Loans [Member] | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans	885	1,286
Current	160,764	137,609
Total loans	161,649	138,895
Loans 90 days past due and still accruing	16
Non- accrual	2,103	2,003
Total Loans [Member] | Originated and acquired loans [Member] | Energy Loans [Member]
Loans [Line Items]
Total past due loans	923	1,645
Current	39,290	55,815
Total loans	40,213	57,460
Non- accrual	923	1,645
Total Loans [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	5,641	3,813
Current	841,514	699,665
Total loans	847,155	703,478
Loans 90 days past due and still accruing	238
Non- accrual	6,628	5,183
Total Loans [Member] | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	366	168
Current	25,869	24,407
Total loans	26,235	24,575
Loans 90 days past due and still accruing	135
Non- accrual	36	140
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total loans	112,309	120,623
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	24,702	29,475
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	75,277	77,908
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	12,000	12,759
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	330	481
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member]
Loans [Line Items]
Total past due loans	5,880	4,545
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans	465
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total past due loans		1,097
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	1,083	554
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	440	696
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans		56
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans	465	1,153
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total past due loans	2,535	1,167
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total past due loans	1,002	233
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	1,674	1,835
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans	151	585
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	3,537	1,400
Total Loans [Member] | 30-59 Days Past Due | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	204	157
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member]
Loans [Line Items]
Total past due loans	2,170	1,099
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans	941
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	116	117
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	534
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	10
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans	951
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total past due loans	309	885
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total past due loans	238	91
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	650	117
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	547	976
Total Loans [Member] | 60-89 Days Past Due | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	22	6
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member]
Loans [Line Items]
Total past due loans	8,080	7,913
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans	642	179
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total past due loans	51
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Multifamily [Member]
Loans [Line Items]
Total past due loans	29
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	1,214	1,389
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	2,790	1,983
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans		574
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans	722	753
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total past due loans	1,517	1,396
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total past due loans	40	41
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	5,661	5,718
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans	734	701
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Energy Loans [Member]
Loans [Line Items]
Total past due loans	923	1,645
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	1,557	1,437
Total Loans [Member] | Greater than 90 Days Past Due | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	140	$ 5
Non Accrual [Member]
Loans [Line Items]
Non- accrual	$ 23,700

Loans - (Credit Exposure for Lo

Loans - (Credit Exposure for Loans as Determined by Company's Internal Risk Rating System) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Loans [Line Items]
Total Loans	$ 3,702,334	$ 3,178,947	$ 2,953,655
Commercial Loan [Member]
Loans [Line Items]
Total Loans	2,105,899	1,874,605
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	859,155	716,237
Consumer [Member]
Loans [Line Items]
Total Loans	26,565	25,056
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	710,715	563,049
Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	3,590,025	3,058,324
Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	2,081,197	1,845,130
Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	847,155	703,478
Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	26,235	24,575
Originated and acquired loans [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	635,438	485,141
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	112,309	120,623	$ 140,064
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	24,702	29,475
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	12,000	12,759
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	330	481
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	75,277	77,908
Total Loans [Member]
Loans [Line Items]
Total Loans	3,702,334	3,178,947
Total Loans [Member] | Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	3,590,025	3,058,324
Total Loans [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total Loans	1,495,088	1,376,022
Total Loans [Member] | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	161,649	138,895
Total Loans [Member] | Originated and acquired loans [Member] | Energy Loans [Member]
Loans [Line Items]
Total Loans	40,213	57,460
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	2,081,197	1,845,130
Total Loans [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	635,438	485,141
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	112,086	107,681
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	23,109	14,415
Total Loans [Member] | Originated and acquired loans [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	51,741	26,947
Total Loans [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	384,247	272,753
Total Loans [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	448,502	336,098
Total Loans [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	847,155	703,478
Total Loans [Member] | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total Loans	748,444	646,482
Total Loans [Member] | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total Loans	98,711	56,996
Total Loans [Member] | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	26,235	24,575
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	112,309	120,623
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	24,702	29,475
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	12,000	12,759
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	330	481
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	75,277	77,908
Total Loans [Member] | Pass [Member]
Loans [Line Items]
Total Loans	3,555,116	3,059,969
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	3,477,582	2,975,079
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total Loans	1,460,896	1,349,116
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	156,059	118,068
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Energy Loans [Member]
Loans [Line Items]
Total Loans	39,290	55,814
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	2,004,778	1,773,222
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	613,168	479,959
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	110,850	107,502
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	22,276	14,415
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	49,605	24,817
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	348,533	250,224
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	430,437	333,225
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	833,439	697,466
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total Loans	736,336	641,294
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total Loans	97,103	56,172
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	26,197	24,432
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	77,534	84,890
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	19,846	23,954
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	9,306	10,072
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	208	327
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	48,174	50,537
Total Loans [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	66,518	51,188
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	63,451	48,171
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total Loans	13,070	10,829
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	3,487	18,824
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	42,050	46,683
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	15,133	1,396
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	25,493	17,030
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	15,133	1,396
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	6,267	91
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total Loans	5,720	91
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total Loans	547
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	1	1
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	3,067	3,017
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	1,073	1,070
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	1,074	1,055
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	8	9
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	912	883
Total Loans [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	79,523	66,329
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	47,815	33,613
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total Loans	20,219	14,824
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	1,902	1,870
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Energy Loans [Member]
Loans [Line Items]
Total Loans	923	1,646
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	33,192	23,764
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	7,137	3,786
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans	1,236	179
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	833
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	2,136	2,130
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	10,148	5,424
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	2,932	1,477
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	7,449	5,921
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Senior lien
Loans [Line Items]
Total Loans	6,388	5,097
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Junior lien
Loans [Line Items]
Total Loans	1,061	824
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	37	142
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total Loans	31,708	32,716
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	3,783	4,451
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	1,620	1,632
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	114	145
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	26,191	26,488
Total Loans [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	1,177	1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member]
Loans [Line Items]
Total Loans	1,177	1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total Loans	903	1,253
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Agriculture [Member]
Loans [Line Items]
Total Loans	201	133
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	1,177	1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	$ 73	$ 75

Loans - (Additional Information

Loans - (Additional Information Regarding Impaired Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans [Line Items]
Unpaid principal balance, Total	$ 45,709	$ 41,351
Recorded investment of impaired loans	34,672	30,873
Loans and Leases Receivable, Allowance	1,217	1,500
Commercial and Industrial [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	7,036	6,481
Recorded investment with no related allowance recorded	5,562	5,055
Unpaid principal balance of impaired loans with an allowance recorded	6,884	7,919
Recorded investment of impaired loans with an allowance recorded	4,284	5,339
Allowance for loan losses allocated with an allowance recorded	906	1,329
Agriculture [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	1,508	1,502
Recorded investment with no related allowance recorded	1,259	1,245
Unpaid principal balance of impaired loans with an allowance recorded	2,225	2,122
Recorded investment of impaired loans with an allowance recorded	2,182	2,083
Allowance for loan losses allocated with an allowance recorded	201	133
Energy Loans [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	6,889	8,661
Recorded investment with no related allowance recorded	2,171	3,861
Commercial Loan [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	23,159	20,830
Recorded investment with no related allowance recorded	16,456	14,095
Unpaid principal balance of impaired loans with an allowance recorded	10,530	10,914
Recorded investment of impaired loans with an allowance recorded	7,719	8,135
Allowance for loan losses allocated with an allowance recorded	1,185	1,466
Commercial Construction [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		215
Recorded investment with no related allowance recorded		179
Commercial Acquisition/Development [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	1,065
Recorded investment with no related allowance recorded	833
Multifamily [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	29	29
Recorded investment with no related allowance recorded	29	29
Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	7,726	4,186
Recorded investment with no related allowance recorded	7,464	3,934
Unpaid principal balance of impaired loans with an allowance recorded	1,421	873
Recorded investment of impaired loans with an allowance recorded	1,253	713
Allowance for loan losses allocated with an allowance recorded	78	4
Non Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	962	901
Recorded investment with no related allowance recorded	845	853
Unpaid principal balance of impaired loans with an allowance recorded	200	207
Recorded investment of impaired loans with an allowance recorded	193	200
Allowance for loan losses allocated with an allowance recorded	1	1
Total Commercial Real Estate [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	2,056	1,145
Recorded investment with no related allowance recorded	1,707	1,061
Unpaid principal balance of impaired loans with an allowance recorded	200	207
Recorded investment of impaired loans with an allowance recorded	193	200
Allowance for loan losses allocated with an allowance recorded	1	1
Senior lien
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	1,738	333
Recorded investment with no related allowance recorded	1,563	309
Unpaid principal balance of impaired loans with an allowance recorded	6,329	6,481
Recorded investment of impaired loans with an allowance recorded	5,553	5,753
Allowance for loan losses allocated with an allowance recorded	24	24
Junior lien
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	393
Recorded investment with no related allowance recorded	300
Unpaid principal balance of impaired loans with an allowance recorded	1,262	1,295
Recorded investment of impaired loans with an allowance recorded	1,142	1,179
Allowance for loan losses allocated with an allowance recorded	7	8
Residential Real Estate Segment [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	2,131	333
Recorded investment with no related allowance recorded	1,863	309
Unpaid principal balance of impaired loans with an allowance recorded	7,591	7,776
Recorded investment of impaired loans with an allowance recorded	6,695	6,932
Allowance for loan losses allocated with an allowance recorded	31	32
Consumer [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	42
Recorded investment with no related allowance recorded	39
Unpaid principal balance of impaired loans with an allowance recorded		146
Recorded investment of impaired loans with an allowance recorded		141
Allowance for loan losses allocated with an allowance recorded		1
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded	27,388	22,308
Recorded investment with no related allowance recorded	20,065	15,465
Impaired Loans With Related Allowance Recorded [Member]
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded	18,321	19,043
Recorded investment of impaired loans with an allowance recorded	14,607	15,408
Allowance for loan losses allocated with an allowance recorded	$ 1,217	$ 1,500

Loans - (Impaired Loans - Avera

Loans - (Impaired Loans - Average Recorded Investment and Interest Income Recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loans [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 35,057	$ 40,766
Impaired Financing Receivable, Interest Income, Cash Basis Method	161	119
Commercial and Industrial [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,534	8,095
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	83	48
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,339	3,445
Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7,487	3,885
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	18	18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,265	678
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	5	5
Agriculture [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,259	2,588
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,126	156
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	1
Energy Loans [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,353	6,098
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	20
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		6,589
Commercial Loan [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	16,633	20,666
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	127	66
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,730	10,868
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	6	6
Commercial Acquisition/Development [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	886
Multifamily [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	29	32
Non Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	876	329
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	4	7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	196	223
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	3
Total Commercial Real Estate [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,762	329
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	4	7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	225	255
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	3
Senior lien
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,612	1,047
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		3
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,601	5,791
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	13	21
Junior lien
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	305
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,151	1,625
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	9	13
Residential Real Estate Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,917	1,047
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		3
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,752	7,416
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	22	34
Consumer [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	14	4
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24	181
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	20,326	22,046
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	131	76
Impaired Loans With Related Allowance Recorded [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14,731	18,720
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 30	$ 43

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)item	Mar. 31, 2017loan
Troubled Debt Restructurings [Member]
Debt Instrument [Line Items]
TDR's modified within the past year that defaulted on their restructured terms	1	0
Number of restructured loans | item	4
Recorded investment | $	$ 0.9
Agriculture and Consumer loans [Member]
Debt Instrument [Line Items]
TDR's modified within the past year that defaulted on their restructured terms | item	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0.2

Loans - (Additional Informati61

Loans - (Additional Information Related to Accruing TDR's) (Details) - Accruing TDR [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Loans [Line Items]
Recorded investment	$ 8,676	$ 8,460
Average year-to- date recorded investment	8,629	9,261
Unpaid principal balance	9,517	9,092
Unfunded commitments to fund TDRs	1,904	2,043
Commercial [Member]
Loans [Line Items]
Recorded investment	7,045	6,595
Average year-to- date recorded investment	6,985	7,308
Unpaid principal balance	7,832	7,171
Unfunded commitments to fund TDRs	1,902	2,041
Commercial Real Estate [Member]
Loans [Line Items]
Recorded investment	426	455
Average year-to- date recorded investment	431	489
Unpaid principal balance	471	500
Residential Real Estate Segment [Member]
Loans [Line Items]
Recorded investment	1,205	1,409
Average year-to- date recorded investment	1,213	1,461
Unpaid principal balance	1,214	1,420
Unfunded commitments to fund TDRs	$ 2	2
Consumer [Member]
Loans [Line Items]
Recorded investment		1
Average year-to- date recorded investment		3
Unpaid principal balance		$ 1

Loans - (Summary of Company's C

Loans - (Summary of Company's Carrying Value of Non-Accrual TDR's) (Details) - Non-Accruing TDR [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 4,679	$ 7,255
Commercial [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	3,113	5,808
Commercial Real Estate [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	29
Residential Real Estate Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 1,537	1,336
Consumer [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's		$ 111

Loans - (Re-Measurement of Loan

Loans - (Re-Measurement of Loans Accounted for Under ASC Topic 310-30 Resulting in Changes in Carrying Amount of Accretable Yield) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield beginning balance	$ 46,568	$ 60,476
Reclassification from non-accretable difference	5,409	5,385
Reclassification to non-accretable difference	(1,390)	(399)
Accretion	(5,394)	(5,871)
Accretable yield ending balance	$ 45,193	$ 59,591

Loans - (Composition of Net Boo

Loans - (Composition of Net Book Value for Loans Accounted for under ASC Topic 310-30) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Contractual cash flows	$ 488,637	$ 489,892
Non-accretable difference	(331,135)	(322,701)
Accretable yield	(45,193)	(46,568)
Loans accounted for under ASC 310-30	$ 112,309	$ 120,623

Allowance for Loan Losses - (Su

Allowance for Loan Losses - (Summary of Company's Allowance for Loan Losses ("All") and Recorded Investment in Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 31,264	$ 29,174
Provision (recoupment) for loan losses	41	1,795
Ending balance	30,686	30,850
Carrying amount of loan investments			$ 3,702,334	$ 3,178,947	$ 2,953,655
Loans	31,264	29,174	30,686	31,264	30,850
Total Loans			3,702,334	3,178,947	2,953,655
Originated and acquired loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	31,193	28,949
Charge-offs	(716)	(210)
Recoveries	97	91
Provision (recoupment) for loan losses		1,800
Ending balance	30,574	30,630
Ending allowance balance individually evaluated for impairment			1,218		2,916
Ending allowance balance collectively evaluated for impairment			29,355		27,714
Loans individually evaluated for impairment			34,672		41,103
Loans collectively evaluated for impairment			3,555,353		2,772,488
Carrying amount of loan investments			3,590,025	3,058,324
Loans	31,193	28,949	30,574	31,193	30,630
Total Loans			3,590,025	3,058,324
ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	71	225
Provision (recoupment) for loan losses	41	(5)
Ending balance	112	220
Carrying amount of loan investments			112,309	120,623	140,064
Loans	71	225	112	71	220
Total Loans			112,309	120,623	140,064
ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	113	220
Loans	113	220	113		220
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	21,385	18,821
Ending balance	21,578	20,539
Carrying amount of loan investments			2,105,899		1,641,596
Loans	21,385	18,821	21,578	21,385	20,539
Total Loans			2,105,899		1,641,596
Commercial Portfolio Segment [Member] | Originated and acquired loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	21,340	18,821
Charge-offs	(437)	(20)
Recoveries	42	11
Provision (recoupment) for loan losses	540	1,727
Ending balance	21,485	20,539
Ending allowance balance individually evaluated for impairment			1,185		2,866
Ending allowance balance collectively evaluated for impairment			20,300		17,673
Loans individually evaluated for impairment			24,175		31,946
Loans collectively evaluated for impairment			2,057,022		1,572,715
Loans	21,340	18,821	21,485	21,340	20,539
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	45
Provision (recoupment) for loan losses	48
Ending balance	93
Carrying amount of loan investments			24,702		36,935
Loans	45		93	45
Total Loans			24,702		36,935
Commercial Portfolio Segment [Member] | ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	93
Loans	93		93
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,965	4,387
Ending balance	3,928	4,216
Carrying amount of loan investments			859,155		746,455
Loans	3,965	4,387	3,928	3,965	4,216
Total Loans			859,155		746,455
Residential Portfolio Segment [Member] | Originated and acquired loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,965	4,387
Charge-offs		(8)
Recoveries	2	3
Provision (recoupment) for loan losses	(39)	(166)
Ending balance	3,928	4,216
Ending allowance balance individually evaluated for impairment			31		47
Ending allowance balance collectively evaluated for impairment			3,897		4,169
Loans individually evaluated for impairment			8,558		8,403
Loans collectively evaluated for impairment			838,597		722,582
Loans	3,965	4,387	3,928	3,965	4,216
Residential Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Carrying amount of loan investments			12,000		15,470
Total Loans			12,000		15,470
Consumer Loan [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	305	324
Ending balance	290	280
Carrying amount of loan investments			26,565		27,611
Loans	305	324	290	305	280
Total Loans			26,565		27,611
Consumer Loan [Member] | Originated and acquired loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	305	319
Charge-offs	(279)	(182)
Recoveries	53	67
Provision (recoupment) for loan losses	211	72
Ending balance	290	276
Ending allowance balance individually evaluated for impairment					2
Ending allowance balance collectively evaluated for impairment			290		274
Loans individually evaluated for impairment			38		180
Loans collectively evaluated for impairment			26,197		26,614
Loans	305	319	290	305	276
Consumer Loan [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		5
Provision (recoupment) for loan losses		(1)
Ending balance		4
Carrying amount of loan investments			330		817
Loans		5			4
Total Loans			330		817
Consumer Loan [Member] | ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		4
Loans		4			4
Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,609	5,642
Ending balance	4,890	5,815
Carrying amount of loan investments			710,715		537,993
Loans	5,609	5,642	4,890	5,609	5,815
Total Loans			710,715		537,993
Commercial Real Estate Portfolio Segment [Member] | Originated and acquired loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,583	5,422
Recoveries		10
Provision (recoupment) for loan losses	(712)	167
Ending balance	4,871	5,599
Ending allowance balance individually evaluated for impairment			2		1
Ending allowance balance collectively evaluated for impairment			4,868		5,598
Loans individually evaluated for impairment			1,901		574
Loans collectively evaluated for impairment			633,537		450,577
Loans	5,583	5,422	4,871	5,583	5,599
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	26	220
Provision (recoupment) for loan losses	(7)	(4)
Ending balance	19	216
Carrying amount of loan investments			75,277		86,842
Loans	26	220	19	$ 26	216
Total Loans			75,277		86,842
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	20	216
Loans	$ 20	$ 216	$ 20		$ 216

Allowance for Loan Losses - (Na

Allowance for Loan Losses - (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Allowance For Loan And Lease Losses [Line Items]
Provision (recoupment) for loan losses	$ 41	$ 1,795
Impaired loans	14,900
Energy Loans [Member]
Allowance For Loan And Lease Losses [Line Items]
Specific Reserve in Provision			$ 500
Commercial and Industrial [Member]
Allowance For Loan And Lease Losses [Line Items]
Impaired loans	7,500
Originated and acquired loans [Member]
Allowance For Loan And Lease Losses [Line Items]
Charge-offs, net	600	100
Provision (recoupment) for loan losses		1,800
ASC 310-30 [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision (recoupment) for loan losses	$ 41	$ (5)

Other Real Estate Owned - (Summ

Other Real Estate Owned - (Summary of Activity in OREO Balances) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Real Estate [Roll Forward]
Balance	$ 10,491	$ 15,662
Purchases through acquisition at fair value	1,409
Transfers from loan portfolio, at fair value	127	578
Impairments	(38)	(46)
Sales, net	(114)	(642)
Balance	$ 11,875	$ 15,552

Other Real Estate Owned - (Narr

Other Real Estate Owned - (Narrative) (Details) - USD ($)	3 Months Ended		15 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018
FDIC Loss-Sharing Related
Minority interests in OREO which are held by outside banks			$ 700,000
Loss (gain) on OREO sales, net	$ (78,000)	$ 112,000

Goodwill and Intangible Asset69

Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Goodwill and Intangible Assets
Goodwill acquired	$ 114,909			$ 59,630
Mortgage loans serviced	441,000
Peoples Inc Member
Goodwill and Intangible Assets
Goodwill acquired	55,300		$ 55,278
Core Deposits
Goodwill and Intangible Assets
Intangible assets acquired	48,800
Amortization of acquired identifiable intangibles	$ 700	$ 1,400
Core Deposits | Minimum
Goodwill and Intangible Assets
Amortization period	7 years
Core Deposits | Maximum
Goodwill and Intangible Assets
Amortization period	10 years
Core Deposits | Peoples Inc Member
Goodwill and Intangible Assets
Intangible assets acquired	$ 10,500		10,477
Mortgage servicing rights
Goodwill and Intangible Assets
Intangible assets acquired	4,300
Amortization of acquired identifiable intangibles	171
Valuation allowance	$ 0
Mortgage servicing rights | Minimum
Goodwill and Intangible Assets
Discount rate (as a percent)	9.50%
Prepayment speed rate (as a percent)	8.70%
Mortgage servicing rights | Maximum
Goodwill and Intangible Assets
Discount rate (as a percent)	10.50%
Prepayment speed rate (as a percent)	11.30%
Mortgage servicing rights | Peoples Inc Member
Goodwill and Intangible Assets
Intangible assets acquired	$ 4,300		$ 4,301

Goodwill and Intangible Asset70

Goodwill and Intangible Assets (Carrying Amounts) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Carrying amount of intangible assets
Gross carrying amount	$ 53,135	$ 38,357
Accumulated amortization	37,574	36,750
Net carrying amount	15,561	1,607
Core Deposits
Carrying amount of intangible assets
Gross carrying amount	48,834	38,357
Accumulated amortization	37,403	36,750
Net carrying amount	11,431	$ 1,607
Mortgage servicing rights
Carrying amount of intangible assets
Gross carrying amount	4,301
Accumulated amortization	171
Net carrying amount	$ 4,130

Goodwill and Intangible Asset71

Goodwill and Intangible Assets (Changes in Servicing Rights) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Changes in the mortgage servicing rights
Beginning balance	$ 1,607
Ending balance	15,561
Mortgage servicing rights
Changes in the mortgage servicing rights
Purchased through acquisitions	4,301
Amortization	(171)
Ending balance	4,130
Fair value of mortgage servicing rights	$ 4,712

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 25,100		$ 5,700
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Earliest	2,018
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Last	2,020
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	$ 847,900
FHLB advances	77,300		129,100
Interest expense related to FHLB advances	$ 460	$ 197
Minimum
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate range of FHLB advances	1.55%
Maximum
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate range of FHLB advances	2.33%
Federal Home Loan Bank of Des Moines [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 27,800		28,100
U.S. Treasury Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 166,300		$ 136,100

Regulatory Capital - (Capital R

Regulatory Capital - (Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	9.60%	9.80%
Common equity risk-based ratio	12.40%	12.90%
Risk-based capital Ratio	12.40%	12.90%
Total risk-based capital Ratio	13.20%	13.80%
Leverage Amount	$ 527,873	$ 470,877
Common equity risk-based amount	527,873	470,877
Risk-based capital amount	527,873	470,877
Total risk-based capital Amount	$ 559,623	$ 502,917
Required to be considered adequately capitalized Ratio, leverage ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	7.00%	7.00%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	8.50%	8.50%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	10.50%	10.50%
Required to be considered adequately capitalized leverage Amount	$ 220,218	$ 191,559
Required to be considered adequately capitalized common equity capital amount	385,382	335,228
Required to be considered adequately capitalized risk-based capital Amount	361,114	309,400
Required to be considered adequately capitalized Total risk-based capital Amount	$ 446,082	$ 382,200
NBH Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	8.80%	8.10%
Common equity risk-based ratio	11.40%	10.60%
Risk-based capital Ratio	11.40%	10.60%
Total risk-based capital Ratio	12.20%	11.50%
Leverage Amount	$ 482,069	$ 382,918
Common equity risk-based amount	482,069	382,918
Risk-based capital amount	482,069	382,918
Total risk-based capital Amount	$ 513,819	$ 414,958
Required to be considered well capitalized Ratio, leverage ratio	5.00%	5.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	6.50%	6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio	8.00%	8.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio	10.00%	10.00%
Required to be considered well capitalized leverage Amount	$ 273,067	$ 237,772
Required to be considered well capitalized common equity capital amount	354,987	309,103
Required to be considered well capitalized risk-based capital Amount	338,103	289,022
Required to be considered well capitalized Total risk-based capital Amount	$ 422,628	$ 361,277
Required to be considered adequately capitalized Ratio, leverage ratio	4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	7.00%	7.00%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	8.50%	8.50%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	10.50%	10.50%
Required to be considered adequately capitalized leverage Amount	$ 218,454	$ 190,217
Required to be considered adequately capitalized common equity capital amount	382,294	332,881
Required to be considered adequately capitalized risk-based capital Amount	359,234	307,086
Required to be considered adequately capitalized Total risk-based capital Amount	$ 443,760	$ 379,341

Revenue from Contracts with C74

Revenue from Contracts with Customers - (Non-interest income) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue from Contracts with Customers
Loss (gain) on OREO sales, net	$ (78,000)	$ 112,000
ASU 2014-09
Revenue from Contracts with Customers
Non-interest income	17,835,000	8,696,000
Contract balances	0		$ 0
ASU 2014-09 | In-scope of Topic 606
Revenue from Contracts with Customers
Non-interest income	8,537,000	6,595,000
Loss (gain) on OREO sales, net	78,000	(112,000)
Total Revenue	8,615,000	6,483,000
ASU 2014-09 | In-scope of Topic 606 | Service Charges and other fees
Revenue from Contracts with Customers
Non-interest income	5,175,000	3,791,000
ASU 2014-09 | In-scope of Topic 606 | Bank card fees
Revenue from Contracts with Customers
Non-interest income	3,362,000	2,804,000
ASU 2014-09 | Out-of-scope of Topic 606
Revenue from Contracts with Customers
Non-interest income	$ 9,298,000	$ 2,101,000

Stock-based Compensation and Em

Stock-based Compensation and Employee Benefits - (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage	33.30%
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 200,000	$ 200,000
Unrecognized compensation expense	$ 1,200,000
Unrecognized compensation cost, weighted-average period, years	2 years 8 months 12 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	66,321
Weighted average grant-date fair value, Granted (in dollars per share)	$ 32.84
Stock based compensation expense	$ 400,000	600,000
Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value, Granted (in dollars per share)	$ 11.28
Unrecognized compensation expense	$ 2,500,000
Unrecognized compensation cost, weighted-average period, years	2 years 7 months 6 days
Market-based stock awards | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	26,594
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period	5 years
Unrecognized compensation expense	$ 100,000
Unrecognized compensation cost, weighted-average period, years	10 months 24 days
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	77,125
Weighted average grant-date fair value, Granted (in dollars per share)	$ 30.38
Stock based compensation expense	$ 200,000	$ 100,000
Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	77,125
Unrecognized compensation expense	$ 3,100,000
Unrecognized compensation cost, weighted-average period, years	2 years 3 months 18 days
Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member] | EPS target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards based on performance type	60.00%
Weighted average grant-date fair value, Granted (in dollars per share)	$ 32.65
Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member] | TSR target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards based on performance type	40.00%
Weighted average grant-date fair value, Granted (in dollars per share)	$ 27.51
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	400,000
Maximum stock purchases by employees, value	$ 25,000
Maximum stock purchases by employees (in shares)	2,000
Discount on purchase of common stock (as a percent)	90.00%
Offering period for employee stock purchases	6 months
Employees purchased shares under the ESPP (in shares)	5,960	5,373
Minimum | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term	7 years
Minimum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum | Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial target awards	0.00%
Maximum | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term	10 years
Maximum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum | Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial target awards	150.00%

Stock-based Compensation and 76

Stock-based Compensation and Benefits - (Summary of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, beginning	1,598,318
Granted, Options	148,198
Forfeited, Options	(9,595)
Exercised, Options	(220,877,000)
Outstanding Options, ending	1,516,044	1,598,318
Options fully vested and exercisable at end of period, Options	1,152,875
Options expected to vest, Options	1,477,364
Outstanding, Weighted average exercise price, beginning	$ 20.62
Granted, Weighted average exercise price	32.74
Forfeited, Weighted average exercise price	27.69
Exercised, Weighted average exercise price	19.74
Outstanding, Weighted average exercised price, ending	21.89	$ 20.62
Options fully vested and exercisable at end of period, Weighted average exercise price	19.85
Options expected to vest, Weighted average exercise price	$ 21.64
Outstanding, Weighted average remaining contractual term in years	4 years 4 months 17 days	4 years 26 days
Options fully vested and exercisable at end of period, weighted average remaining contractual term in years	2 years 11 months 12 days
Options expected to vest, Weighted average remaining contractual term in years	4 years 2 months 27 days
Outstanding, Aggregate intrinsic value, beginning	$ 19,017
Outstanding, Outstanding, Aggregate intrinsic value, beginning	17,295	$ 19,017
Aggregate intrinsic Value of Options fully vested and exercisable at end of period	15,450
Options expected to vest, Aggregate Intrinsic Value	$ 17,220

Stock-based Compensation and 77

Stock-based Compensation and Benefits - (Summary of Restricted Stock Activity) (Details)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested Restricted shares, Beginning (in shares) | shares	163,557
Unvested Restricted shares, Vested (in shares) | shares	(182)
Unvested Restricted shares, Granted (in shares) | shares	66,321
Unvested Restricted shares, Forfeited (in shares) | shares	(7,914)
Unvested Restricted shares, Ending (in shares) | shares	221,782
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Beginning (in dollars per share) | $ / shares	$ 22.60
Weighted average grant-date fair value, Vested (in dollars per share) | $ / shares	18.48
Weighted average grant-date fair value, Granted (in dollars per share) | $ / shares	32.84
Weighted average grant-date fair value, Forfeited (in dollars per share) | $ / shares	28.20
Weighted average grant-date fair value, Ending (in dollars per share) | $ / shares	$ 25.47
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested Restricted shares, Beginning (in shares) | shares	125,082
Unvested Restricted shares, Granted (in shares) | shares	77,125
Unvested Restricted shares, Forfeited (in shares) | shares	(5,351)
Unvested Restricted shares, Ending (in shares) | shares	196,856
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Beginning (in dollars per share) | $ / shares	$ 23.90
Weighted average grant-date fair value, Granted (in dollars per share) | $ / shares	30.38
Weighted average grant-date fair value, Forfeited (in dollars per share) | $ / shares	28.05
Weighted average grant-date fair value, Ending (in dollars per share) | $ / shares	$ 26.33

Warrants (Narrative) (Details)

Warrants (Narrative) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Warrants and Rights Note Disclosure [Abstract]
Warrants granted, exercise price per share		$ 20	$ 20	$ 20
Warrants settled or exercised	250,750

Common Stock - (Narrative) (Det

Common Stock - (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Aug. 05, 2016
Schedule Of Common Stock [Line Items]
Remaining authorized amount	$ 12.6
Shares outstanding	30,479,969	26,875,585
Common Class A [Member]
Schedule Of Common Stock [Line Items]
Shares outstanding	30,479,969	26,875,585
Restricted issued but not yet vested, shares	221,782	163,557
New Board Authorized Share Repurchase Program
Schedule Of Common Stock [Line Items]
Stock repurchase program, authorized amount			$ 50

Income Per Share - (Narrative)

Income Per Share - (Narrative) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Mar. 31, 2016
Shares outstanding	30,479,969
Outstanding stock options to purchase common stock	1,516,044	1,719,701	1,598,318
Outstanding stock options to purchase common stock, per share	$ 21.89	$ 20.56	$ 20.62
Warrants granted, exercise price per share		$ 20	$ 20	$ 20
Restricted shares outstanding	418,638	490,528
Warrant [Member]
Dilutive Convertible Securities		33,783

Income Per Share - (Schedule of

Income Per Share - (Schedule of Computation of Basic and Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 8,464	$ 8,258
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(13)	(8)
Income available to common stockholders (numerator)	$ 8,451	$ 8,250
Weighted average common shares outstanding (denominator)	30,493,689	26,801,773
Weighted average shares outstanding for diluted earnings per common share	31,143,528	27,680,029
Income per share-basic (in dollars per share)	$ 0.28	$ 0.31
Income per share-diluted (in dollars per share)	$ 0.27	$ 0.30
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities	649,839	844,473
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities		33,783

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income tax rate	16.70%	(17.70%)
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 0.4	$ 2.8

Derivatives - (FV of Derivative

Derivatives - (FV of Derivatives on the Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives fair value	$ 21,496	$ 10,489
Liability derivatives fair value	121	1,167
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	4,515	2,616
Liability derivatives fair value	3,780	2,591
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	110,700
Other assets [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives fair value	21,496	10,489
Liability derivatives fair value	121
Other assets [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	3,199	2,483
Liability derivatives fair value	3,179
Other assets [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	1,219	128
Liability derivatives fair value	312
Other assets [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	97	5
Liability derivatives fair value	$ 289
Other liabilities [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives fair value		1,167
Other liabilities [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value		2,584
Other liabilities [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value		$ 7

Derivatives - (Narrative) (Deta

Derivatives - (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional amount	$ 131.4	$ 9
Termination value of derivatives in net liability position	3.3
Collateral Already Posted, Aggregate Fair Value	0.2
Hedged Loans	507.8
Cumulative fair value hedge adjusmtnet	(20.5)
Interest Rate Lock Commitments Notional Amount Member
Derivative [Line Items]
Notional amount		8
Designated as Hedging Instrument [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Notional amount	462.9	417.7
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Notional amount	$ 184	$ 202.2

Derivatives - (Derivatives on t

Derivatives - (Derivatives on the Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives	$ 1,605		$ (102)
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives	12,052	$ 1,064
Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on hedged items	(11,917)		(1,241)
Interest rate products [Member] | Designated as Hedging Instrument [Member] | Other Non-Interest income [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives		1,064
Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Non-Interest expense [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives	122		(32)
Interest rate products [Member] | Fair Value Hedging [Member] | Other Non-Interest income [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on hedged items		$ (1,241)
Interest rate products [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest income [Member]
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives	12,052
Amount of gain or (loss) recognized in income on hedged items	(11,917)
Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Mortgage banking income member
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives	1,108		(193)
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Mortgage banking income member
Derivative [Line Items]
Amount of gain or (loss) recognized in income on derivatives	$ 375		$ 123

Commitments and Contingencies86

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Commitment And Contingencies [Line Items]
Loan commitments	$ 786.9	$ 680.8
Mortgage Repurchase Reserve	4.3
Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Standby letters of credit	$ 8.1	$ 7.2

Commitments and Contingencies87

Commitments and Contingencies (Schedule of Total Unfunded Commitments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 795,059	$ 687,946
Commitments to fund loans [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	235,078	181,904
Unfunded Commitment Line Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	551,838	498,857
Commercial And Standby Letters Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 8,143	$ 7,185

Fair Value Measurements - (Ta88

Fair Value Measurements - (Tables of Financial Instruments Measured At Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 994,238	$ 872,441
Total liabilities at fair value	3,901	3,758
Loans held for sale member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	51,050	4,629
Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	818	829
Mortgage-Backed Securities (MBS) [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	188,630	168,648
Mortgage-Backed Securities (MBS) [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	727,729	685,230
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	992,922	872,308
Total liabilities at fair value	3,300	3,751
Level 2 [Member] | Loans held for sale member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	51,050	4,629
Level 2 [Member] | Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	818	829
Level 2 [Member] | Mortgage-Backed Securities (MBS) [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	188,630	168,648
Level 2 [Member] | Mortgage-Backed Securities (MBS) [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	727,729	685,230
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,316	133
Total liabilities at fair value	601	7
Interest rate swap derivatives [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	24,695	12,972
Total liabilities at fair value	3,300	3,751
Interest rate swap derivatives [Member] | Level 2 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	24,695	12,972
Total liabilities at fair value	3,300	3,751
Mortgage banking derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value		133
Total liabilities at fair value			$ 7
Mortgage banking derivatives | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,316
Total liabilities at fair value	601
Mortgage banking derivatives | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value		$ 133
Total liabilities at fair value			$ 7
Mortgage banking derivatives | Level 3 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,316
Total liabilities at fair value	$ 601

Fair Value Measurements - (Ta89

Fair Value Measurements - (Table of Changes in Level 3 Financial Instruments) (Details) - Derivative Financial Instruments Assets and Liabilities [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 126
Realized gain (loss) included in earnings—net mortgage banking derivatives	589
Ending Balance	$ 715

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)loan	Mar. 31, 2017USD ($)loan	Dec. 31, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 3,702,334	$ 2,953,655	$ 3,178,947
Impairment on other real estate owned	$ 38	$ 46
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Loans measured | loan	6	3
Loans	$ 6,400		$ 10,600
Nonrecurring Loans Reserves	$ 1,200	$ 2,900

Fair Value Measurements - (Inpu

Fair Value Measurements - (Inputs Used to Determine Fair Values of Oreo are Considered Level 3 Inputs in Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on a non-recurring basis	$ 11,875	$ 15,552
Losses From Fair Value Changes	38	46
Impaired loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on a non-recurring basis	34,672	41,103
Losses From Fair Value Changes	$ 715	$ 209

Fair Value Measurements - (Ta92

Fair Value Measurements - (Table of Valuation Techniques and Unobservable Inputs Used in Valuation of Financial Instruments Falling Within Level 3 of Fair Value Hierarchy) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets at fair value	$ 994,238,000	$ 872,441,000
Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Prepayment speed	$ 8.7
Minimum | Impaired loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Appraised values Discount rate	0.00%
Minimum | Mortgage servicing rights member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Appraised values Discount rate	9.50%
Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Prepayment speed	$ 11.3
Maximum | Impaired loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Appraised values Discount rate	25.00%
Maximum | Mortgage servicing rights member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Appraised values Discount rate	10.50%

Fair Value of Financial Instr93

Fair Value of Financial Instruments - (Schedule of Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS:
Cash and cash equivalents	$ 286,870	$ 257,364
Investment securities available-for-sale (at fair value)	917,865	855,345
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	283,369	258,730
Non-marketable securities	14,088	15,030
Loans held-for-sale	51,050	4,629
LIABILITIES:
Time deposits	1,147,452	1,118,050
Securities sold under agreements to repurchase	141,187	130,463
Federal Home Loan Bank advances	77,335	129,115
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	188,630	168,648
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	191,136	204,352
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	727,729	685,230
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	92,233	54,378
Other Securities [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	469	419
Municipal [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	1,037	1,048
Carrying Amount [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	286,870	257,364
Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Non-marketable securities	14,088	15,030
Loans held-for-sale	51,050	4,629
Accrued interest receivable	18,343	14,255
LIABILITIES:
Deposit transaction accounts	3,561,858	2,861,509
Time deposits	1,147,452	1,118,050
Securities sold under agreements to repurchase	141,187	130,463
Federal Home Loan Bank advances	77,335	129,115
Accrued interest payable	7,198	5,776
Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Loans receivable, net	3,702,334	3,178,947
Carrying Amount [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	188,630	168,648
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	191,136	204,352
Carrying Amount [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	727,729	685,230
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	92,233	54,378
Carrying Amount [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	469	419
Carrying Amount [Member] | Municipal [Member] | Level 2 [Member]
ASSETS:
Municipal obligations	818	829
Carrying Amount [Member] | Municipal [Member] | Level 3 [Member]
ASSETS:
Municipal obligations	219	219
Estimated Fair Value [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	286,870	257,364
Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Non-marketable securities	14,088	15,030
Loans held-for-sale	51,050	4,629
Accrued interest receivable	18,343	14,255
LIABILITIES:
Deposit transaction accounts	3,561,858	2,861,509
Time deposits	1,147,452	1,118,050
Securities sold under agreements to repurchase	141,187	130,463
Federal Home Loan Bank advances	77,647	130,300
Accrued interest payable	7,198	5,776
Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Loans receivable, net	3,670,007	3,167,508
Estimated Fair Value [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	188,630	168,648
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	188,609	204,048
Estimated Fair Value [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	727,729	685,230
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	90,107	52,723
Estimated Fair Value [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	469	419
Estimated Fair Value [Member] | Municipal [Member] | Level 2 [Member]
ASSETS:
Municipal obligations	818	829
Estimated Fair Value [Member] | Municipal [Member] | Level 3 [Member]
ASSETS:
Municipal obligations	219	219
Interest rate swap derivatives [Member] | Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Derivative asset	24,695	12,972
LIABILITIES:
Derivative liability	3,300	3,751
Interest rate swap derivatives [Member] | Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Derivative asset	24,695	12,972
LIABILITIES:
Derivative liability	3,300	3,751
Mortgage banking derivatives | Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Derivative asset	1,316	133
LIABILITIES:
Derivative liability	601	7
Mortgage banking derivatives | Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Derivative asset	1,316	133
LIABILITIES:
Derivative liability	$ 601	$ 7

Fair Value of Financial Instr94

Fair Value of Financial Instruments - (Additional Information) (Details)	3 Months Ended
	Mar. 31, 2018
Fair Value Of Financial Instruments [Abstract]
Residential mortgage loans held for sale period	45 days