MidWestOne Financial (MOFG) 10-Q 2 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document Information [Line Items]
Entity Registrant Name	MIDWESTONE FINANCIAL GROUP, INC.
Entity Central Index Key	1,412,665
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Trading Symbol	MOFG
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		12,221,107

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 41,547	$ 44,818
Interest-earning deposits in banks	1,717	5,474
Federal funds sold	0	680
Cash and cash equivalents	43,264	50,972
Investment securities:
Equity securities, at fair value	2,809	2,336
Debt securities available for sale, at fair value	438,312	445,324
Debt securities held to maturity (fair value of $188,407 as of June 30, 2018 and $194,343 as of December 31, 2017)	192,896	195,619
Loans held for sale	1,528	856
Loans held for investment, net of unearned fees	2,364,035	2,286,695
Less: Allowance for loan losses	(30,800)	(28,059)
Loans held for investment, net	2,333,235	2,258,636
Premises and equipment, net	78,106	75,969
Interest receivable	13,636	14,732
Goodwill	64,654	64,654
Other intangible assets, net	10,925	12,046
Bank-owned life insurance	60,209	59,831
Other real estate owned	676	2,010
Deferred income taxes	9,014	6,525
Other assets	27,013	22,761
Total assets	3,276,277	3,212,271
Deposits:
Non-interest-bearing demand	469,862	461,969
Interest-bearing checking	1,183,384	1,228,112
Savings	216,866	213,430
Certificates of deposit under $100,000	341,584	324,681
Certificates of deposit $100,000 and over	392,505	377,127
Total deposits	2,604,201	2,605,319
Federal funds purchased	52,421	1,000
Securities sold under agreements to repurchase	75,046	96,229
Federal Home Loan Bank borrowings	143,000	115,000
Junior subordinated notes issued to capital trusts	23,841	23,793
Long-term debt	10,000	12,500
Deferred compensation liability	5,267	5,199
Interest payable	1,744	1,428
Other liabilities	14,556	11,499
Total liabilities	2,930,076	2,871,967
Shareholders' equity:
Preferred stock, no par value; authorized 500,000 shares; no shares issued and outstanding at June 30, 2018 and December 31, 2017	0	0
Common stock, $1.00 par value; authorized 30,000,000 shares at June 30, 2018 and December 31, 2017; issued 12,463,481 shares at June 30, 2018 and December 31, 2017; outstanding 12,221,107 shares at June 30, 2018 and 12,219,611 shares at December 31, 2017	12,463	12,463
Additional paid-in capital	187,304	187,486
Treasury stock at cost, 242,374 shares as of June 30, 2018 and 243,870 shares as of December 31, 2017	(5,474)	(5,121)
Retained earnings	159,315	148,078
Accumulated other comprehensive income	(7,407)	(2,602)
Total shareholders' equity	346,201	340,304
Total liabilities and shareholders' equity	$ 3,276,277	$ 3,212,271

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt securities held to maturity, estimated fair value	$ 188,407	$ 194,343
Shareholders' equity:
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	12,463,481	12,463,481
Common stock, shares outstanding	12,221,107	12,219,611
Shares of Treasury stock	242,374	243,870

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Loans	$ 27,486	$ 25,650	$ 54,053	$ 49,929
Bank deposits	18	26	26	31
Federal funds sold	1	1	1	1
Taxable securities	2,940	2,590	5,828	5,308
Tax-exempt securities	1,528	1,587	3,057	3,152
Total interest income	31,973	29,854	62,965	58,421
Interest expense:
Interest-bearing checking	1,291	912	2,376	1,710
Savings	63	51	126	102
Certificates of deposit under $100,000	1,134	886	2,129	1,745
Certificates of deposit $100,000 and over	1,521	995	2,914	1,912
Total interest expense on deposits	4,009	2,844	7,545	5,469
Federal funds purchased	211	25	336	71
Securities sold under agreements to repurchase	144	34	278	72
Federal Home Loan Bank borrowings	615	404	1,132	847
Other borrowings	4	3	6	6
Junior subordinated notes issued to capital trusts	307	240	565	461
Long-term debt	102	113	209	223
Total interest expense	5,392	3,663	10,071	7,149
Net interest income	26,581	26,191	52,894	51,272
Provision for loan losses	1,250	1,240	3,100	2,281
Net interest income after provision for loan losses	25,331	24,951	49,794	48,991
Noninterest income:
Trust, investment and insurance fees	1,537	1,528	3,177	3,140
Service charges and fees on deposit accounts	1,158	1,257	2,326	2,540
Loan origination and servicing fees	906	718	1,847	1,520
Other service charges and fees	1,582	1,497	2,962	2,955
Bank-owned life insurance income	397	318	830	646
Gain on sale or call of debt securities available for sale	0	20	9	20
Gain (loss) on sale or call of debt securities held to maturity	(4)	0	(4)	43
Gain (loss) on sale of premises and equipment	(17)	8	(18)	6
Other gain (loss)	(72)	37	30	50
Total noninterest income	5,487	5,383	11,159	10,920
Noninterest expense:
Salaries and employee benefits	12,225	11,789	24,596	23,673
Occupancy and equipment, net	3,238	3,033	6,489	6,337
Professional fees	959	1,036	1,753	2,058
Data processing	691	548	1,379	1,259
FDIC insurance	392	352	711	719
Amortization of intangibles	589	804	1,246	1,653
Other	2,437	2,402	4,715	4,600
Total noninterest expense	20,531	19,964	40,889	40,299
Income before income tax expense	10,287	10,370	20,064	19,612
Income tax expense	2,131	3,136	4,115	5,665
Net income	$ 8,156	$ 7,234	$ 15,949	$ 13,947
Per share information:
Earnings per common share - basic	$ 0.67	$ 0.59	$ 1.31	$ 1.18
Earnings per common share - diluted	0.67	0.59	1.30	1.17
Dividends paid per common share	$ 0.195	$ 0.165	$ 0.390	$ 0.330

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 8,156	$ 7,234	$ 15,949	$ 13,947
Other comprehensive income, available for sale debt securities:
Unrealized holding gains (losses) arising during period	(1,628)	2,745	(6,416)	4,312
Reclassification adjustment for gains included in net income	0	(20)	(9)	(20)
Income tax (expense) benefit	425	(1,070)	1,677	(1,686)
Other comprehensive income (loss) on available for sale debt securities	(1,203)	1,655	(4,748)	2,606
Other comprehensive income (loss), net of tax	(1,203)	1,655	(4,748)	2,606
Comprehensive income	$ 6,953	$ 8,889	11,201	16,553
AOCI Attributable to Parent [Member]
Net income			0	0
Other comprehensive income, available for sale debt securities:
Other comprehensive income (loss), net of tax			$ (4,748)	$ 2,606

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total		Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2016	$ 305,456		$ 0	$ 11,713	$ 163,667	$ (5,766)	$ 136,975	$ (1,133)
Net income	13,947		0	0	0	0	13,947	0
Issuance of common stock, net of expenses	24,360		0	750	23,610	0	0	0
Dividends paid on common stock	(3,907)		0	0	0	0	(3,907)	0
Stock options exercised	91		0	0	(81)	172	0	0
Release/lapse of restriction on RSUs	(107)		0	0	(560)	453	0	0
Stock compensation	426		0	0	426	0	0
Other comprehensive income (loss), net of tax	2,606		0	0	0	0	0	2,606
Balance at Jun. 30, 2017	342,872		0	12,463	187,062	(5,141)	147,015	1,473
Balance at Dec. 31, 2017	340,304		0	12,463	187,486	(5,121)	148,078	(2,602)
Cumulative effect of changes in accounting principles	0	[1]	0	0	0	0	57	(57)
Net income	15,949		0	0	0	0	15,949	0
Dividends paid on common stock	(4,769)		0	0	0	0	(4,769)	0
Stock options exercised	135		0	0	(69)	204	0	0
Release/lapse of restriction on RSUs	(84)		0	0	(609)	525	0	0
Repurchase of common stock	(1,082)					(1,082)
Stock compensation	496		0	0	496	0	0	0
Other comprehensive income (loss), net of tax	(4,748)		0	0	0	0	0	(4,748)
Balance at Jun. 30, 2018	$ 346,201		$ 0	$ 12,463	$ 187,304	$ (5,474)	$ 159,315	$ (7,407)
[1]	Impact from adoption on January 1, 2018 of ASU 2016-01, 'Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.”

Consolidated Statement of Share

Consolidated Statement of Shareholders' Equity Parenthetical (Parentheticals) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Dividends paid on common stock (per share)	$ 0.390	$ 0.330
Common Stock
Repurchase of common stock (shares)	33,998	0
Common Stock
Issuance of common stock (shares)	0	750,000
Stock options exercised (shares)	9,700	8,250
Release/lapse of restriction on RSUs (shares)	28,525	26,875
Additional Paid-in Capital
Expenses incurred in issuance of common stock	$ 0	$ 1,328

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 15,949	$ 13,947
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,100	2,281
Depreciation, amortization and accretion	2,105	2,058
Amortization of other intangibles	1,246	1,653
Amortization of premiums and discounts on investment securities, net	(492)	(650)
(Gain) loss on sale of premises and equipment	18	(6)
Deferred income taxes	803	554
Excess tax benefit from share-based award activity	0	(91)
Stock-based compensation	496	426
Net losses on equity securities	23	0
Net gain on sale or call of debt securities available for sale	(9)	(20)
Net (gain) loss on sale or call of debt securities held to maturity	4	(43)
Net gain on sale of other real estate owned	(50)	(30)
Net gain on sale of loans held for sale	(802)	(799)
Writedown of other real estate owned	5	23
Origination of loans held for sale	30,140	41,284
Proceeds from sales of loans held for sale	30,270	44,688
Decrease in interest receivable	1,096	1,265
Increase in cash surrender value of bank-owned life insurance	(830)	(646)
Decrease in other assets	(4,252)	(935)
Increase in deferred compensation liability	68	44
Increase in interest payable, accounts payable, accrued expenses, and other liabilities	3,373	568
Net cash provided by operating activities	21,359	23,195
Cash flows from investing activities:
Purchases of equity securities	(505)	(2)
Proceeds from sales of debt securities available for sale	496	9,999
Proceeds from maturities and calls of debt securities available for sale	30,942	41,162
Purchases of debt securities available for sale	(31,194)	(12,839)
Proceeds from sales of debt securities held to maturity	0	1,153
Proceeds from maturities and calls of debt securities held to maturity	3,132	2,998
Purchases of debt securities held to maturity	(553)	(18,292)
Net increase in loans	(78,203)	(34,188)
Purchases of premises and equipment	(4,212)	(1,697)
Proceeds from sale of other real estate owned	1,883	825
Proceeds from sale of premises and equipment	0	28
Proceeds of principal and earnings from bank-owned life insurance	452	0
Payments to acquire intangible assets	125	0
Net cash used in investing activities	(77,887)	(10,853)
Cash flows from financing activities:
Net increase (decrease) in deposits	(1,118)	13,261
Increase in federal funds purchased	51,421	9,635
Decrease in securities sold under agreements to repurchase	(21,183)	(22,005)
Proceeds from Federal Home Loan Bank borrowings	85,000	50,000
Repayment of Federal Home Loan Bank borrowings	(57,000)	(75,000)
Proceeds from stock options exercised	135	1
Excess tax benefit from share-based award activity	0	91
Taxes paid relating to net share settlement of equity awards	(84)	(108)
Payments on long-term debt	(2,500)	(2,500)
Dividends paid	(4,769)	(3,907)
Proceeds from issuance of common stock	0	25,688
Payments of stock issuance costs	0	(1,328)
Repurchase of common stock	(1,082)	0
Net cash provided by (used in) financing activities	48,820	(6,172)
Net increase (decrease) in cash and cash equivalents	(7,708)	6,170
Cash and cash equivalents at beginning of period	50,972	43,228
Cash and cash equivalents at end of period	43,264	49,398
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	9,755	7,070
Cash paid during the period for income taxes	1,710	5,975
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	504	207
Accounting Standards Update 2016-01
Supplemental schedule of non-cash investing activities:
Transfer due to adoption of ASU 2016-01, equity securities fair value adjustment, reclassification from AOCI to Retained Earnings, net of tax	$ 57	$ 0

Derivatives and Hedging Activit

Derivatives and Hedging Activities Schedule of Other Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Rate Swap | Other Gain (Loss) | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Other gain (loss), net	$ (19)	$ 0	$ (19)	$ 0

Derivatives and Hedging Activ10

Derivatives and Hedging Activities Offsetting Derivative Assets and Liabilities - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative Asset [Abstract]
Gross amount of recognized assets	$ 113	$ 0
Gross amount offset in the balance sheet	0	0
Net amount of assets presented in the balance sheet	113	0
Financial instruments	0	0
Cash collateral received	0	0
Net assets	113	0
Derivative Liability [Abstract]
Gross amount of recognized liabilities	(158)	0
Gross amount offset in the balance sheet	0	0
Net amount of liabilities presented in the balance sheet	158	0
Financial instruments	0	0
Cash collateral paid	0	0
Net liabilities	$ 158	$ 0

Principles of Consolidation and

Principles of Consolidation and Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Principles of Consolidation and Presentation MidWest One Financial Group, Inc. (the “Company,” which is also referred to herein as “we,” “our” or “us”) is an Iowa corporation incorporated in 1983, a bank holding company under the Bank Holding Company Act of 1956, as amended, and a financial holding company under the Gramm-Leach-Bliley Act of 1999. Our principal executive offices are located at 102 South Clinton Street, Iowa City, Iowa 52240. The Company owns all of the common stock of MidWest One Bank, an Iowa state non-member bank chartered in 1934 with its main office in Iowa City, Iowa (the “Bank”), and all of the common stock of MidWest One Insurance Services, Inc., Oskaloosa, Iowa. We operate primarily through MidWest One Bank, our bank subsidiary, and MidWest One Insurance Services, Inc., our wholly-owned subsidiary that operates an insurance agency business through six offices located in central and east-central Iowa. The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all the information and notes necessary for complete financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”). The information in this Quarterly Report on Form 10-Q is written with the presumption that the users of the interim financial statements have read or have access to the most recent Annual Report on Form 10-K of the Company, filed with the Securities and Exchange Commission (SEC) on March 1, 2018 , which contains the latest audited financial statements and notes thereto, together with Management’s Discussion and Analysis of Financial Condition and Results of Operations as of December 31, 2017 and for the year then ended. Management believes that the disclosures in this Form 10-Q are adequate to make the information presented not misleading. In the opinion of management, the accompanying consolidated financial statements contain all adjustments (consisting of only normal recurring accruals) necessary to present fairly the Company’s financial position as of June 30, 2018 and December 31, 2017 , and the results of operations and cash flows for the three and six months ended June 30, 2018 and 2017 . All significant intercompany accounts and transactions have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect: (1) the reported amounts of assets and liabilities, (2) the disclosure of contingent assets and liabilities at the date of the financial statements, and (3) the reported amounts of revenues and expenses during the reporting period. These estimates are based on information available to management at the time the estimates are made. Actual results could differ from those estimates. The results for the three and six months ended June 30, 2018 may not be indicative of results for the year ending December 31, 2018 , or for any other period. All significant accounting policies followed in the preparation of the quarterly financial statements are disclosed in the Annual Report on Form 10-K for the year ended December 31, 2017 . In the consolidated statements of cash flows, cash and cash equivalents include cash and due from banks, interest-bearing deposits in banks, and federal funds sold. Certain reclassifications have been made to prior periods’ consolidated financial statements to present them on a basis comparable with the current period’s consolidated financial statements.

Effect of New Financial Account

Effect of New Financial Accounting Standards	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Effect of New Financial Accounting Standards Accounting Guidance Adopted in 2018 In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contract with Customers (Topic 606). Subsequent to the issuance of ASU 2014-09, the FASB issued targeted updates to clarify specific implementation issues including ASU No. 2016-08, “Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU No. 2016-10, “ Identifying Performance Obligations and Licensing, ” ASU No. 2016-12, “ Narrow-Scope Improvements and Practical Expedients, ” and ASU No. 2016-20 “ Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers. ” For financial reporting purposes, the standard allows for either full retrospective adoption, meaning the standard is applied to all of the periods presented, or modified retrospective adoption, meaning the standard is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. Since the guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, the new guidance did not have a material impact on revenue most closely associated with financial instruments, including interest income and expense. The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASU, including trust and asset management fees, service charges on deposit accounts, sales of other real estate, and debit card interchange fees. Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. The Company also completed its evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue (i.e., gross versus net). Based on its evaluation, the Company determined that ASU 2014-09 also did not materially change the method in which the Company currently recognizes costs for these revenue streams. The Company adopted this update on January 1, 2018, utilizing the modified retrospective transition method. Since there was no net income impact upon adoption of the new guidance, a cumulative effect adjustment to opening retained earnings was not deemed necessary. See Note 14 “Revenue Recognition” for more information. In January 2016, the FASB issued Accounting Standards Update No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance in this update makes changes to the current GAAP model primarily affect the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. The treatment of gains and losses for all equity securities, including those without a readily determinable market value, is expected to result in additional volatility in the income statement, with the loss of mark to market via equity for these investments. Additionally, changes in the allowable method for determining the fair value of financial instruments in the financial statement footnotes (“exit price” only) require changes to current methodologies of determining these values, and how they are disclosed in the financial statement footnotes. The new standard applies to public business entities in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this update on January 1, 2018. With the elimination of the classification of available for sale equity securities, the net unrealized gain or loss on these securities that had been included in accumulated other comprehensive income at December 31, 2017, in the amount of $57,000 , has been transferred to retained earnings, as shown in the Consolidated Statement of Shareholders’ Equity. Changes in the fair value of equity securities with readily determinable fair values are now reflected in the noninterest income portion of the Consolidated Statements of Income, in the other gains (losses) line item. In accordance with the ASU requirements, the Company measured the fair value of its loan portfolio as of June 30, 2018 using an exit price notion. See Note 13. “Estimated Fair Value of Financial Instruments and Fair Value Measurements” to our consolidated financial statements. Accounting Guidance Pending Adoption at June 30, 2018 In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) . The guidance in this update is meant to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. All leases create an asset and a liability for the lessee in accordance with FASB Concepts Statement No. 6, Elements of Financial Statements , and, therefore, recognition of those lease assets and lease liabilities represents an improvement over previous GAAP, which did not require lease assets and lease liabilities to be recognized for most leases. Disclosures are required by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. To meet that objective, qualitative disclosures along with specific quantitative disclosures are required. The new standard applies to public business entities in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The Company has several lease agreements, such as branch locations, which are currently considered operating leases, and therefore not recognized on the Company’s consolidated balance sheets. The Company expects the new guidance will require these lease agreements to now be recognized on the consolidated balance sheets as right-of-use assets and a corresponding lease liability. However, the Company continues to evaluate the extent of the potential impact the new guidance will have on the Company’s consolidated financial statements and the availability of outside vendor products to assist in the implementation, and does not expect to early adopt the standard. In June 2016, the FASB issued Accounting Standards Update No. 2016-13, Financial Instruments-Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments . The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The amendment requires the use of a new model covering current expected credit losses (CECL), which will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. Upon initial recognition of the exposure, the CECL model requires an entity to estimate the credit losses expected over the life of an exposure (or pool of exposures). The estimate of expected credit losses (ECL) should consider historical information, current information, and reasonable and supportable forecasts,

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Investment Securities The amortized cost and fair value of debt securities available for sale, with gross unrealized gains and losses, were as follows: As of June 30, 2018 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government agencies and corporations $ 5,594 $ — $ 51 $ 5,543 State and political subdivisions 140,935 1,321 541 141,715 Mortgage-backed securities 55,864 128 1,622 54,370 Collateralized mortgage obligations 179,862 7 7,859 172,010 Corporate debt securities 66,080 17 1,423 64,674 Total $ 448,335 $ 1,473 $ 11,496 $ 438,312 As of December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government agencies and corporations $ 15,716 $ — $ 90 $ 15,626 State and political subdivisions 139,561 2,475 197 141,839 Mortgage-backed securities 48,744 181 428 48,497 Collateralized mortgage obligations 173,339 29 5,172 168,196 Corporate debt securities 71,562 31 427 71,166 Total $ 448,922 $ 2,716 $ 6,314 $ 445,324 The amortized cost and fair value of debt securities held to maturity, with gross unrealized gains and losses, were as follows: As of June 30, 2018 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value State and political subdivisions $ 125,948 $ 289 $ 3,063 $ 123,174 Mortgage-backed securities 11,586 2 472 11,116 Collateralized mortgage obligations 20,243 — 1,020 19,223 Corporate debt securities 35,119 264 489 34,894 Total $ 192,896 $ 555 $ 5,044 $ 188,407 As of December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government agencies and corporations $ 10,049 $ — $ — $ 10,049 State and political subdivisions 126,413 804 1,631 125,586 Mortgage-backed securities 1,906 4 13 1,897 Collateralized mortgage obligations 22,115 — 707 21,408 Corporate debt securities 35,136 548 281 35,403 Total $ 195,619 $ 1,356 $ 2,632 $ 194,343 Investment securities with a carrying value of $235.2 million and $237.4 million at June 30, 2018 and December 31, 2017 , respectively, were pledged on public deposits, securities sold under agreements to repurchase and for other purposes, as required or permitted by law. As of June 30, 2018 , the Company owned $0.4 million of equity securities in banks and financial service-related companies, and $2.4 million of mutual funds invested in debt securities and other debt instruments that will cause units of the fund to be deemed to be qualified under the Community Reinvestment Act. Prior to January 1, 2018, we accounted for our marketable equity securities at fair value with unrealized gains and losses recognized in accumulated other comprehensive income on the balance sheet. Realized gains and losses on marketable equity securities sold or impaired were recognized in noninterest income. Effective with the January 1, 2018 adoption of ASU 2016-01, both the realized and unrealized net gains and losses on equity securities are required to be recognized in the statement of income. A breakdown between net realized and unrealized gains and losses is provided later in this financial statement footnote. These net changes are included in the other gains line item in the noninterest income section of the Consolidated Statements of Income . The summary of investment securities shows that some of the securities in the available for sale and held to maturity investment portfolios had unrealized losses, or were temporarily impaired, as of June 30, 2018 and December 31, 2017 . This temporary impairment represents the estimated amount of loss that would be realized if the securities were sold on the valuation date. The following tables present information pertaining to securities with gross unrealized losses as of June 30, 2018 and December 31, 2017 , aggregated by investment category and length of time that individual securities have been in a continuous loss position: As of June 30, 2018 Number of Securities Less than 12 Months 12 Months or More Total Available for Sale Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) U.S. Government agencies and corporations 2 $ 5,543 $ 51 $ — $ — $ 5,543 $ 51 State and political subdivisions 73 35,538 471 2,757 70 38,295 541 Mortgage-backed securities 27 53,518 1,447 6,176 175 59,694 1,622 Collateralized mortgage obligations 43 46,904 958 120,274 6,901 167,178 7,859 Corporate debt securities 12 54,441 1,183 8,440 240 62,881 1,423 Total 157 $ 195,944 $ 4,110 $ 137,647 $ 7,386 $ 333,591 $ 11,496 As of December 31, 2017 Number of Securities Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) U.S. Government agencies and corporations 3 $ 15,626 $ 90 $ — $ — $ 15,626 $ 90 State and political subdivisions 34 11,705 167 1,800 30 13,505 197 Mortgage-backed securities 20 37,964 359 3,961 69 41,925 428 Collateralized mortgage obligations 35 37,881 489 122,757 4,683 160,638 5,172 Corporate debt securities 12 55,340 298 8,778 129 64,118 427 Other equity securities 1 — — 1,944 56 1,944 56 Total 105 $ 158,516 $ 1,403 $ 139,240 $ 4,967 $ 297,756 $ 6,370 As of June 30, 2018 Number of Securities Less than 12 Months 12 Months or More Total Held to Maturity Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) State and political subdivisions 224 $ 49,218 $ 1,135 $ 27,690 $ 1,928 $ 76,908 $ 3,063 Mortgage-backed securities 6 10,203 438 841 34 11,044 472 Collateralized mortgage obligations 7 4,690 187 14,520 833 19,210 1,020 Corporate debt securities 7 12,882 318 2,724 171 15,606 489 Total 244 $ 76,993 $ 2,078 $ 45,775 $ 2,966 $ 122,768 $ 5,044 As of December 31, 2017 Number of Securities Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) State and political subdivisions 167 $ 33,237 $ 393 $ 25,843 $ 1,238 $ 59,080 $ 1,631 Mortgage-backed securities 4 349 2 887 11 1,236 13 Collateralized mortgage obligations 7 5,221 90 16,168 617 21,389 707 Corporate debt securities 3 3,093 4 2,617 277 5,710 281 Total 181 $ 41,900 $ 489 $ 45,515 $ 2,143 $ 87,415 $ 2,632 The Company's assessment of OTTI is based on its reasonable judgment of the specific facts and circumstances impacting each individual debt security at the time such assessments are made. The Company reviews and considers factual information, including expected cash flows, the structure of the debt security, the creditworthiness of the issuer, the type of underlying assets and the current and anticipated market conditions. At June 30, 2018 and December 31, 2017 , the Company’s mortgage-backed securities and collateralized mortgage obligations portfolios consisted of securities predominantly backed by one- to four-family mortgage loans and underwritten to the standards of and guaranteed by the following government-sponsored agencies: the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Government National Mortgage Association. The receipt of principal, at par, and interest on mortgage-backed securities is guaranteed by the respective government-sponsored agency guarantor, such that the Company believes that its mortgage-backed securities and collateralized mortgage obligations do not expose the Company to credit-related losses. At June 30, 2018 , approximately 55% of the municipal bonds held by the Company were Iowa-based, and approximately 22% were Minnesota-based. The Company does not intend to sell these municipal obligations, and it is more likely than not that the Company will not be required to sell them until the recovery of their cost. Due to the issuers’ continued satisfaction of their obligations under the securities in accordance with their contractual terms and the expectation that they will continue to do so, management’s intent and ability to hold these securities for a period of time sufficient to allow for any anticipated recovery in fair value, as well as the evaluation of the fundamentals of the issuers’ financial conditions and other objective evidence, the Company believed that the municipal obligations identified in the tables above were temporarily impaired as of June 30, 2018 and December 31, 2017 . At June 30, 2018 and December 31, 2017 , all but one of the Company’s corporate bonds held an investment grade rating from Moody’s, S&P or Kroll, or carried a guarantee from an agency of the US government. We have evaluated financial statements of the company issuing the non-investment grade bond and found the company’s earnings and equity position to be satisfactory and in line with industry norms. Therefore, we expect to receive all contractual payments. The internal evaluation of the non-investment grade bond along with the investment grade ratings on the remainder of the corporate portfolio lead us to conclude that all of the corporate bonds in our portfolio will continue to pay according to their contractual terms. Since the Company has the ability and intent to hold securities until price recovery, we believe that there is no other-than-temporary-impairment in the corporate bond portfolio. It is reasonably possible that the fair values of the Company’s investment securities could decline in the future if interest rates increase or the overall economy or the financial conditions of the issuers deteriorate. As a result, there is a risk that OTTI may be recognized in the future, and any such amounts could be material to the Company’s consolidated statements of income. Unless certain conditions are met, investment securities classified as held to maturity may not be sold without calling into question the Company’s intent to hold other debt securities so classified (“tainting”). One acceptable condition, outlined in Accounting Standards Codification 320-10-25-6(a), is the significant deterioration of an issuer’s creditworthiness. During the first quarter of 2017, $1.2 million of debt securities from a single issuer in the state and political subdivisions category were identified by the Company as having an elevated level of credit risk and were internally classified as “watch.” Given the significant deterioration of the issuer’s creditworthiness, the Company sold the debt securities in March 2017. The Company believes the sale was in accordance with applicable accounting guidance and did not taint the remainder of the held to maturity portfolio. The contractual maturity distribution of investment debt securities at June 30, 2018 , is summarized as follows: Available For Sale Held to Maturity (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 39,542 $ 39,518 $ 520 $ 521 Due after one year through five years 107,415 106,371 23,357 23,016 Due after five years through ten years 62,298 62,685 94,804 93,529 Due after ten years 3,354 3,358 42,386 41,002 Debt securities without a single maturity date 235,726 226,380 31,829 30,339 Total $ 448,335 $ 438,312 $ 192,896 $ 188,407 Mortgage-backed securities and collateralized mortgage obligations are collateralized by mortgage loans and guaranteed by U.S. government agencies. Our experience has indicated that principal payments will be collected sooner than scheduled because of prepayments. Therefore, these securities are not scheduled in the maturity categories indicated above. Realized gains and losses on sales are determined on the basis of specific identification of investments based on the trade date. Realized gains (losses) on investments due to sale or call, including impairment losses for the three and six months ended June 30, 2018 and 2017 , were as follows: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Debt securities available for sale: Gross realized gains $ — $ 20 9 20 Gross realized gain $ — $ 20 $ 9 $ 20 Debt securities held to maturity: Gross realized gains $ — $ — $ — $ 43 Gross realized losses (4 ) — (4 ) — Gross realized gain (loss) $ (4 ) $ — $ (4 ) $ 43 The following tables present the net gains and losses on equity investments during the three and six months ended June 30, 2018 , disaggregated into realized and unrealized gains and losses: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2018 Net losses recognized $ (7 ) $ (23 ) Less: Net gains and losses recognized due to sales — — Unrealized losses on securities still held at the reporting date $ (7 ) $ (23 )

Loans Receivable and the Allowa

Loans Receivable and the Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans Receivable and the Allowance for Loan Losses The composition of allowance for loan losses and loans by portfolio segment and based on impairment method are as follows: Allowance for Loan Losses and Recorded Investment in Loan Receivables As of June 30, 2018 and December 31, 2017 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total June 30, 2018 Allowance for loan losses: Individually evaluated for impairment $ 287 $ 3,093 $ 3,950 $ 163 $ — $ 7,493 Collectively evaluated for impairment 2,369 5,464 12,053 2,353 256 22,495 Purchased credit impaired loans — — 338 474 — 812 Total $ 2,656 $ 8,557 $ 16,341 $ 2,990 $ 256 $ 30,800 Loans receivable Individually evaluated for impairment $ 8,056 $ 12,865 $ 20,477 $ 3,756 $ — $ 45,154 Collectively evaluated for impairment 95,373 499,438 1,209,911 459,045 36,936 2,300,703 Purchased credit impaired loans — 54 13,506 4,618 — 18,178 Total $ 103,429 $ 512,357 $ 1,243,894 $ 467,419 $ 36,936 $ 2,364,035 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total December 31, 2017 Allowance for loan losses: Individually evaluated for impairment $ 140 $ 1,126 $ 2,157 $ 226 $ — $ 3,649 Collectively evaluated for impairment 2,650 7,392 11,144 2,182 244 23,612 Purchased credit impaired loans — — 336 462 — 798 Total $ 2,790 $ 8,518 $ 13,637 $ 2,870 $ 244 $ 28,059 Loans receivable Individually evaluated for impairment $ 2,969 $ 9,734 $ 10,386 $ 3,722 $ — $ 26,811 Collectively evaluated for impairment 102,543 493,844 1,147,133 460,475 36,158 2,240,153 Purchased credit impaired loans — 46 14,452 5,233 — 19,731 Total $ 105,512 $ 503,624 $ 1,171,971 $ 469,430 $ 36,158 $ 2,286,695 As of June 30, 2018 , the gross purchased credit impaired loans included above were $19.3 million , with a discount of $1.1 million . Loans with unpaid principal in the amount of $476.8 million and $477.6 million at June 30, 2018 and December 31, 2017 , respectively, were pledged to the Federal Home Loan Bank (the “FHLB”) as collateral for borrowings. The changes in the allowance for loan losses by portfolio segment were as follows: Allowance for Loan Loss Activity For the Three Months Ended June 30, 2018 and 2017 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total 2018 Beginning balance $ 3,153 $ 8,362 $ 14,997 $ 2,877 $ 282 $ 29,671 Charge-offs (268 ) (3 ) — (3 ) (17 ) (291 ) Recoveries 9 103 40 15 3 170 Provision (238 ) 95 1,304 101 (12 ) 1,250 Ending balance $ 2,656 $ 8,557 $ 16,341 $ 2,990 $ 256 $ 30,800 2017 Beginning balance $ 2,460 $ 6,021 $ 9,751 $ 3,764 $ 221 $ 22,217 Charge-offs (347 ) (464 ) (45 ) (52 ) (135 ) (1,043 ) Recoveries 4 83 5 — 4 96 Provision 549 2,319 (698 ) (1,062 ) 132 1,240 Ending balance $ 2,666 $ 7,959 $ 9,013 $ 2,650 $ 222 $ 22,510 Allowance for Loan Loss Activity For the Six Months Ended June 30, 2018 and 2017 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total 2018 Beginning balance $ 2,790 $ 8,518 $ 13,637 $ 2,870 $ 244 $ 28,059 Charge-offs (268 ) (90 ) (264 ) (107 ) (38 ) (767 ) Recoveries 15 182 116 77 18 408 Provision 119 (53 ) 2,852 150 32 3,100 Ending balance $ 2,656 $ 8,557 $ 16,341 $ 2,990 $ 256 $ 30,800 2017 Beginning balance $ 2,003 $ 6,274 $ 9,860 $ 3,458 $ 255 $ 21,850 Charge-offs (884 ) (529 ) (106 ) (80 ) (160 ) (1,759 ) Recoveries 14 102 15 — 7 138 Provision 1,533 2,112 (756 ) (728 ) 120 2,281 Ending balance $ 2,666 $ 7,959 $ 9,013 $ 2,650 $ 222 $ 22,510 Loan Portfolio Segment Risk Characteristics Agricultural - Agricultural loans, most of which are secured by crops, livestock, and machinery, are provided to finance capital improvements and farm operations as well as acquisitions of livestock and machinery. The ability of the borrower to repay may be affected by many factors outside of the borrower’s control including adverse weather conditions, loss of livestock due to disease or other factors, declines in market prices for agricultural products and the impact of government regulations. The ultimate repayment of agricultural loans is dependent upon the profitable operation or management of the agricultural entity. Collateral for these loans generally includes accounts receivable, inventory, equipment and real estate. However, depending on the overall financial condition of the borrower, some loans are made on an unsecured basis. The collateral securing these loans may depreciate over time, may be difficult to appraise and may fluctuate in value based on the success of the business. Commercial and Industrial - Commercial and industrial loans are primarily made based on the reported cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The collateral support provided by the borrower for most of these loans and the probability of repayment are based on the liquidation of the pledged collateral and enforcement of a personal guarantee, if any exists. The primary repayment risks of commercial and industrial loans are that the cash flows of the borrower may be unpredictable, and the collateral securing these loans may fluctuate in value. The size of the loans the Company can offer to commercial customers is less than the size of the loans that competitors with larger lending limits can offer. This may limit the Company’s ability to establish relationships with the largest businesses in the areas in which the Company operates. As a result, the Company may assume greater lending risks than financial institutions that have a lesser concentration of such loans and tend to make loans to larger businesses. Collateral for these loans generally includes accounts receivable, inventory, equipment and real estate. However, depending on the overall financial condition of the borrower, some loans are made on an unsecured basis. The collateral securing these loans may depreciate over time, may be difficult to appraise and may fluctuate in value based on the success of the business. In addition, a decline in the U.S. economy could harm or continue to harm the businesses of the Company’s commercial and industrial customers and reduce the value of the collateral securing these loans. Commercial Real Estate - The Company offers mortgage loans to commercial and agricultural customers for the acquisition of real estate used in their businesses, such as offices, warehouses and production facilities, and to real estate investors for the acquisition of apartment buildings, retail centers, office buildings and other commercial buildings. The market value of real estate securing commercial real estate loans can fluctuate significantly in a short period of time as a result of market conditions in the geographic area in which the real estate is located. Adverse developments affecting real estate values in one or more of the Company’s markets could increase the credit risk associated with its loan portfolio. Additionally, real estate lending typically involves higher loan principal amounts than other loans, and the repayment of the loans generally is dependent, in large part, on sufficient income from the properties securing the loans to cover operating expenses and debt service. Economic events or governmental regulations outside of the Company’s control or that of the borrower could negatively impact the future cash flow and market values of the affected properties. Residential Real Estate - The Company generally retains short-term residential mortgage loans that are originated for its own portfolio but sells most long-term loans to other parties while retaining servicing rights on the majority of those loans. The market value of real estate securing residential real estate loans can fluctuate as a result of market conditions in the geographic area in which the real estate is located. Adverse developments affecting real estate values in one or more of the Company’s markets could increase the credit risk associated with its loan portfolio. Additionally, real estate lending typically involves higher loan principal amounts than other loans, and the repayment of the loans generally is dependent, in large part, on the borrower’s continuing financial stability, and is therefore more likely to be affected by adverse personal circumstances. Consumer - Consumer loans typically have shorter terms, lower balances, higher yields and higher risks of default than real estate-related loans. Consumer loan collections are dependent on the borrower’s continuing financial stability, and are therefore more likely to be affected by adverse personal circumstances. Collateral for these loans generally includes automobiles, boats, recreational vehicles, mobile homes, and real estate. However, depending on the overall financial condition of the borrower, some loans are made on an unsecured basis. The collateral securing these loans may depreciate over time, may be difficult to recover and may fluctuate in value based on condition. In addition, a decline in the United States economy could result in reduced employment, impacting the ability of customers to repay their obligations. Purchased Loans Policy All purchased loans (nonimpaired and impaired) are initially measured at fair value as of the acquisition date in accordance with applicable authoritative accounting guidance. Credit discounts are included in the determination of fair value. An allowance for loan losses is not recorded at the acquisition date for loans purchased. Individual loans acquired through the completion of a transfer, including loans that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are referred to herein as “purchased credit impaired loans.” In determining the acquisition date fair value and estimated credit losses of purchased credit impaired loans, and in subsequent accounting, the Company accounts for loans individually. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as a yield adjustment or as a loss accrual or valuation allowance. Expected cash flows at the purchase date in excess of the fair value of loans, if any, are recorded as interest income over the expected life of the loans if the timing and amount of future cash flows are reasonably estimable. Subsequent to the purchase date, increases in cash flows over those expected at the purchase date are recognized as interest income prospectively. The present value of any decreases in expected cash flows after the purchase date is recognized by recording an allowance for loan losses and a provision for loan losses. If the Company does not have the information necessary to reasonably estimate cash flows to be expected, it may use the cost-recovery method or cash-basis method of income recognition. Charge-off Policy The Company requires a loan to be charged-off, in whole or in part, as soon as it becomes apparent that some loss will be incurred, or when its collectability is sufficiently questionable that it no longer is considered a bankable asset. The primary considerations when determining if and how much of a loan should be charged-off are as follows: (1) the potential for future cash flows; (2) the value of any collateral; and (3) the strength of any co-makers or guarantors. When it is determined that a loan requires a partial or full charge-off, a request for approval of a charge-off is submitted to the Company's President, Executive Vice President and Chief Credit Officer, and the Senior Regional Loan officer. The Bank's board of directors formally approves all loan charge-offs. Once a loan is charged-off, it cannot be restructured and returned to the Company's books. Allowance for Loan and Lease Losses The Company requires the maintenance of an adequate allowance for loan and lease losses (“ALLL”) in order to cover estimated probable losses without eroding the Company’s capital base. Calculations are done at each quarter end, or more frequently if warranted, to analyze the collectability of loans and to ensure the adequacy of the allowance. In line with FDIC directives, the ALLL calculation does not include consideration of loans held for sale or off-balance-sheet credit exposures (such as unfunded letters of credit). Determining the appropriate level for the ALLL relies on the informed judgment of management, and as such, is subject to inexactness. Given the inherently imprecise nature of calculating the necessary ALLL, the Company’s policy permits the actual ALLL to be between 20% above and 5% below the “indicated reserve.” Loans Reviewed Individually for Impairment The Company identifies loans to be reviewed and evaluated individually for impairment based on current information and events and the probability that the borrower will be unable to repay all amounts due according to the contractual terms of the loan agreement. Specific areas of consideration include: size of credit exposure, risk rating, delinquency, nonaccrual status, and loan classification. The level of individual impairment is measured using one of the following methods: (1) the fair value of the collateral less costs to sell; (2) the present value of expected future cash flows, discounted at the loan's effective interest rate; or (3) the loan's observable market price. Loans that are deemed fully collateralized or have been charged down to a level corresponding with any of the three measurements require no assignment of reserves from the ALLL. A loan modification is a change in an existing loan contract that has been agreed to by the borrower and the Bank, which may or may not be a troubled debt restructure or “TDR.” All loans deemed TDR are considered impaired. A loan is considered a TDR when, for economic or legal reasons related to a borrower’s financial difficulties, a concession is granted to the borrower that would not otherwise be considered. Both financial distress on the part of the borrower and the Bank’s granting of a concession, which are detailed further below, must be present in order for the loan to be considered a TDR. All of the following factors are indicators that the debtor is experiencing financial difficulties (one or more items may be present): • The debtor is currently in default on any of its debt. • The debtor has declared or is in the process of declaring bankruptcy. • There is significant doubt as to whether the debtor will continue to be a going concern. • Currently, the debtor has securities being held as collateral that have been delisted, are in the process of being delisted, or are under threat of being delisted from an exchange. • Based on estimates and projections that only encompass the current business capabilities, the debtor forecasts that its entity-specific cash flows will be insufficient to service the debt (both interest and principal) in accordance with the contractual terms of the existing agreement through maturity. • Absent the current modification, the debtor cannot obtain funds from sources other than the existing creditors at an effective interest rate equal to the current market interest rate for similar debt for a non-troubled debtor. The following factors are potential indicators that a concession has been granted (one or multiple items may be present): • The borrower receives a reduction of the stated interest rate for the remaining original life of the debt. • The borrower receives an extension of the maturity date or dates at a stated interest rate lower that the current market interest rate for new debt with similar risk characteristics. • The borrower receives a reduction of the face amount or maturity amount of the debt as stated in the instrument or other agreement. • The borrower receives a deferral of required payments (principal and/or interest). • The borrower receives a reduction of the accrued interest. The following table sets forth information on the Company’s TDRs by class of loan occurring during the stated periods: Three Months Ended June 30, 2018 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (dollars in thousands) Troubled Debt Restructurings (1) : Commercial real estate: Farmland Extended maturity date 1 $ 86 $ 86 2 $ 176 $ 176 Commercial real estate-other Other — — — 1 10,546 10,923 Total 1 $ 86 $ 86 3 $ 10,722 $ 11,099 Six Months Ended June 30, 2018 2017 (dollars in thousands) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings (1) : Commercial and industrial Extended maturity date — $ — $ — 6 $ 2,037 $ 2,083 Commercial real estate: Farmland Extended maturity date 1 86 86 2 176 176 Commercial real estate-other Extended maturity date — — — 1 968 968 Other — — — 1 10,546 10,923 Total 1 $ 86 $ 86 10 $ 13,727 $ 14,150 (1) TDRs may include multiple concessions, and the disclosure classifications are based on the primary concession provided to the borrower. Loans by class modified as TDRs within 12 months of modification and for which there was a payment default during the stated periods were as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Troubled Debt Restructurings (1) That Subsequently Defaulted: Commercial and industrial Extended maturity date — $ — 1 $ 550 — $ — 4 $ 1,504 Commercial real estate: Commercial real estate-other Extended maturity date — — 1 968 1 2,657 1 968 Total — $ — 2 $ 1,518 1 $ 2,657 5 $ 2,472 (1) TDRs may include multiple concessions, and the disclosure classifications are based on the primary concession provided to the borrower. Loans Reviewed Collectively for Impairment All loans not evaluated individually for impairment will be separated into homogeneous pools to be collectively evaluated. Loans will be first grouped into the various loan types (i.e. commercial, agricultural, consumer, etc.) and further segmented within each subset by risk classification (i.e. pass, special mention/watch, and substandard). Homogeneous loans past due 60-89 days and 90 days or more are classified special mention/watch and substandard, respectively, for allocation purposes. The Company’s historical loss experience for each group segmented by loan type is calculated for the prior 20 quarters as a starting point for estimating losses. In addition, other prevailing qualitative or environmental factors likely to cause probable losses to vary from historical data are incorporated in the form of adjustments to increase or decrease the loss rate applied to each group. These adjustments are documented and fully explain how the current information, events, circumstances, and conditions impact the historical loss measurement assumptions. Although not a comprehensive list, the following are considered key factors and are evaluated with each calculation of the ALLL to determine if adjustments to historical loss rates are warranted: • Changes in national and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments. • Changes in the quality and experience of lending staff and management. • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses. • Changes in the volume and severity of past due loans, classified loans and non-performing loans. • The existence and potential impact of any concentrations of credit. • Changes in the nature and terms of loans such as growth rates and utilization rates. • Changes in the value of underlying collateral for collateral-dependent loans, considering the Company’s disposition bias. • The effect of other external factors such as the legal and regulatory environment. The Company may also consider other qualitative factors for additional allowance allocations, including changes in the Company’s loan review process. Changes in the criteria used in this evaluation or the availability of new information could cause the allowance to be increased or decreased in future periods. In addition, bank regulatory agencies, as part of their examination process, may require adjustments to the allowance for loan losses based on their judgments and estimates. The items listed above are used to determine the pass percentage for loans evaluated under ASC 450, and as such, are applied to the loans risk rated pass. Due to the inherent risks associated with special mention/watch risk-rated loans (i.e. early stages of financial deterioration, technical exceptions, etc.), this subset is reserved at a level that will cover losses above a pass allocation for loans that had a loss in the last 20 quarters in which the loan was risk-rated special mention/watch at the time of the loss. Substandard loans carry greater risk than special mention/watch loans, and as such, this subset is reserved at a level that will cover losses above a pass allocation for loans that had a loss in the last 20 quarters in which the loan was risk-rated substandard at the time of the loss. Ongoing analysis is performed to support these factor multiples. The following tables set forth the risk category of loans by class of loans and credit quality indicator based on the most recent analysis performed, as of June 30, 2018 and December 31, 2017 : (in thousands) Pass Special Mention/ Watch Substandard Doubtful Loss Total June 30, 2018 Agricultural $ 76,987 $ 17,723 $ 8,719 $ — $ — $ 103,429 Commercial and industrial 473,717 21,118 17,517 5 — 512,357 Commercial real estate: Construction and development 203,880 1,216 1,173 — — 206,269 Farmland 70,237 8,514 10,010 — — 88,761 Multifamily 127,072 1,406 1,181 — — 129,659 Commercial real estate-other 754,866 45,300 19,039 — — 819,205 Total commercial real estate 1,156,055 56,436 31,403 — — 1,243,894 Residential real estate: One- to four- family first liens 340,610 3,104 6,567 — — 350,281 One- to four- family junior liens 115,160 706 1,272 — — 117,138 Total residential real estate 455,770 3,810 7,839 — — 467,419 Consumer 36,772 133 3 28 — 36,936 Total $ 2,199,301 $ 99,220 $ 65,481 $ 33 $ — $ 2,364,035 (in thousands) Pass Special Mention/ Watch Substandard Doubtful Loss Total December 31, 2017 Agricultural $ 80,377 $ 21,989 $ 3,146 $ — $ — $ 105,512 Commercial and industrial 453,363 23,153 27,102 6 — 503,624 Commercial real estate: Construction and development 162,968 1,061 1,247 — — 165,276 Farmland 76,740 10,357 771 — — 87,868 Multifamily 131,507 2,498 501 — — 134,506 Commercial real estate-other 731,231 34,056 19,034 — — 784,321 Total commercial real estate 1,102,446 47,972 21,553 — — 1,171,971 Residential real estate: One- to four- family first liens 340,446 2,776 9,004 — — 352,226 One- to four- family junior liens 114,763 952 1,489 — — 117,204 Total residential real estate 455,209 3,728 10,493 — — 469,430 Consumer 36,059 — 68 31 — 36,158 Total $ 2,127,454 $ 96,842 $ 62,362 $ 37 $ — $ 2,286,695 Included within the special mention/watch, substandard, and doubtful categories at June 30, 2018 and December 31, 2017 are purchased credit impaired loans totaling $11.4 million and $12.6 million , respectively. Below are descriptions of the risk classifications of our loan portfolio. Special Mention/Watch - A special mention/watch asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Special mention/watch assets are not adversely classified and do not expose the Company to sufficient risk to warrant adverse classification. Substandard - Substandard loans are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Doubtful - Loans classified as doubtful have all the weaknesses inherent in those classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions and values, highly questionable and improbable. Loss - Loans classified as loss are considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification does not mean that the loan has absolutely no recovery or salvage value but rather it is not practical or desirable to defer writing off this basically worthless asset even though partial recovery may be effected in the future. The following table presents loans individually evaluated for impairment, excluding purchased credit impaired loans, by class of loan, as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: Agricultural $ 6,307 $ 6,807 $ — $ 1,523 $ 2,023 $ — Commercial and industrial 4,162 4,528 — 7,588 7,963 — Commercial real estate: Construction and development 84 84 — 84 84 — Farmland 6,532 6,532 — 287 287 — Multifamily 823 823 — — — — Commercial real estate-other 6,602 7,111 — 5,746 6,251 — Total commercial real estate 14,041 14,550 — 6,117 6,622 — Residential real estate: One- to four- family first liens 2,488 2,540 — 2,449 2,482 — One- to four- family junior liens 302 302 — 26 26 — Total residential real estate 2,790 2,842 — 2,475 2,508 — Consumer — — — — — — Total $ 27,300 $ 28,727 $ — $ 17,703 $ 19,116 $ — With an allowance recorded: Agricultural $ 1,749 $ 1,754 $ 287 $ 1,446 $ 1,446 $ 140 Commercial and industrial 8,703 8,810 3,093 2,146 2,177 1,126 Commercial real estate: Construction and development — — — — — — Farmland 2,123 2,123 648 — — — Multifamily — — — — — — Commercial real estate-other 4,313 11,980 3,302 4,269 11,536 2,157 Total commercial real estate 6,436 14,103 3,950 4,269 11,536 2,157 Residential real estate: One- to four- family first liens 966 966 163 979 979 185 One- to four- family junior liens — — — 268 268 41 Total residential real estate 966 966 163 1,247 1,247 226 Consumer — — — — — — Total $ 17,854 $ 25,633 $ 7,493 $ 9,108 $ 16,406 $ 3,649 Total: Agricultural $ 8,056 $ 8,561 $ 287 $ 2,969 $ 3,469 $ 140 Commercial and industrial 12,865 13,338 3,093 9,734 10,140 1,126 Commercial real estate: Construction and development 84 84 — 84 84 — Farmland 8,655 8,655 648 287 287 — Multifamily 823 823 — — — — Commercial real estate-other 10,915 19,091 3,302 10,015 17,787 2,157 Total commercial real estate 20,477 28,653 3,950 10,386 18,158 2,157 Residential real estate: One- to four- family first liens 3,454 3,506 163 3,428 3,461 185 One- to four- family junior liens 302 302 — 294 294 41 Total residential real estate 3,756 3,808 163 3,722 3,755 226 Consumer — — — — — — Total $ 45,154 $ 54,360 $ 7,493 $ 26,811 $ 35,522 $ 3,649 The following table presents the average recorded investment and interest income recognized for loans individually evaluated for impairment, excluding purchased credit impaired loans, by class of loan, during the stated periods: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Agricultural $ 6,037 $ 296 $ 1,192 $ 66 $ 4,422 $ 363 $ 1,216 $ 79 Commercial and industrial 3,954 98 4,787 67 3,465 144 4,143 90 Commercial real estate: Construction and development 84 — 360 — 84 — 360 — Farmland 5,242 185 1,686 36 3,494 234 2,073 69 Multifamily 825 20 — — 550 30 — — Commercial real estate-other 5,693 130 3,118 71 5,394 177 3,040 103 Total commercial real estate 11,844 335 5,164 107 9,522 441 5,473 172 Residential real estate: One- to four- family first liens 2,438 20 2,409 46 1,757 11 2,417 70 One- to four- family junior liens 297 — 13 — 288 — 13 — Total residential real estate 2,735 20 2,422 46 2,045 11 2,430 70 Consumer — — — — — — — — Total $ 24,570 $ 749 $ 13,565 $ 286 $ 19,454 $ 959 $ 13,262 $ 411 With an allowance recorded: Agricultural $ 1,622 $ 57 $ 1,855 $ 53 $ 1,610 $ 71 $ 1,875 $ 67 Commercial and industrial 7,797 53 4,444 14 7,457 37 3,495 37 Commercial real estate: Construction and development — — 809 — — — 832 — Farmland 2,107 26 — — 1,405 54 — — Multifamily — — — — — — — — Commercial real estate-other 4,360 — 6,294 16 4,586 — 4,410 — Total commercial real estate 6,467 26 7,103 16 5,991 54 5,242 — Residential real estate: One- to four- family first liens 969 18 1,372 17 972 27 1,389 26 One- to four- family junior liens — — — — — — — — Total residential real estate 969 18 1,372 17 972 27 1,389 26 Consumer — — — — — — — — Total $ 16,855 $ 154 $ 14,774 $ 100 $ 16,030 $ 189 $ 12,001 $ 130 Total: Agricultural $ 7,659 $ 353 $ 3,047 $ 119 $ 6,032 $ 434 $ 3,091 $ 146 Commercial and industrial 11,751 151 9,231 81 10,922 181 7,638 127 Commercial real estate: Construction and development 84 — 1,169 — 84 — 1,192 — Farmland 7,349 211 1,686 36 4,899 288 2,073 69 Multifamily 825 20 — — 550 30 — — Commercial real estate-other 10,053 130 9,412 87 9,980 177 7,450 103 Total commercial real estate 18,311 361 12,267 123 15,513 495 10,715 172 Residential real estate: One- to four- family first liens 3,407 38 3,781 63 2,729 38 3,806 96 One- to four- family junior liens 297 — 13 — 288 — 13 — Total residential real estate 3,704 38 3,794 63 3,017 38 3,819 96 Consumer — — — — — — — — Total $ 41,425 $ 903 $ 28,339 $ 386 $ 35,484 $ 1,148 $ 25,263 $ 541 The following table presents the contractual aging of the recorded investment in past due loans by class of loans at June 30, 2018 and December 31, 2017 : (in thousands) 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable June 30, 2018 Agricultural $ 503 $ — $ 280 $ 783 $ 102,646 $ 103,429 Commercial and industrial 1,144 185 6,006 7,335 505,022 512,357 Commercial real estate: Construction and development 11 — 83 94 206,175 206,269 Farmland 515 — 141 656 88,105 88,761 Multifamily — — — — 129,659 129,659 Commercial real estate-other 189 62 3,646 3,897 815,308 819,205 Total commercial real estate 715 62 3,870 4,647 1,239,247 1,243,894 Residential real estate: One- to four- family first liens 1,412 1,170 872 3,454 346,827 350,281 One- to four- family junior liens 120 67 440 627 116,511 117,138 Total residential real estate 1,532 1,237 1,312 4,081 463,338 467,419 Consumer 56 23 19 98 36,838 36,936 Total $ 3,950 $ 1,507 $ 11,487 $ 16,944 $ 2,347,091 $ 2,364,035 Included in the totals above are the following purchased credit impaired loans $ 203 $ 160 $ — $ 363 $ 17,815 $ 18,178 December 31, 2017 Agricultural $ 95 $ 118 $ 168 $ 381 $ 105,131 $ 105,512 Commercial and industrial 1,434 1,336 1,576 4,346 499,278 503,624 Commercial real estate: Construction and development 57 97 82 236 165,040 165,276 Farmland 217 — 373 590 87,278 87,868 Multifamily — 25 — 25 134,481 134,506 Commercial real estate-other 74 — 1,852 1,926 782,395 784,321 Total commercial real estate 348 122 2,307 2,777 1,169,194 1,171,971 Residential real estate: One- to four- family first liens 3,854 756 1,019 5,629 346,597 352,226 One- to four- family junior liens 325 770 271 1,366 115,838 117,204 Total residential real estate 4,179 1,526 1,290 6,995 462,435 469,430 Consumer 79 15 29 123 36,035 36,158 Total $ 6,135 $ 3,117 $ 5,370 $ 14,622 $ 2,272,073 $ 2,286,695 Included in the totals above are the following purchased credit impaired loans $ 164 $ 756 $ 553 $ 1,473 $ 18,258 $ 19,731 Non-accrual and Delinquent Loans Loa

Derivatives and Hedging Activ15

Derivatives and Hedging Activities (Notes)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivatives and Hedging Activities FASB ASC 815, Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. The Company does not use derivatives for trading or speculative purposes. In accordance with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s loans and borrowings. The following table presents the total notional and gross fair value of the Company’s derivatives as of June 30, 2018 and December 31, 2017 . The derivative asset and liability balances are presented on a gross basis, prior to the application of master netting agreements, as included in other assets and other liabilities, respectively, on the Consolidated Balance Sheets. As of June 30, 2018 As of December 31, 2017 Fair Value Fair Value (in thousands) Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Fair value hedges: Interest rate swaps $ 5,605 $ — $ 26 $ — $ — $ — Derivatives not designated as hedging instruments: Interest rate swaps 10,720 113 132 — — — Derivatives Designated as Hedging Instruments The Company is exposed to changes in the fair value of certain of its fixed-rate assets due to changes in benchmark interest rates. The Company uses interest rate swaps to manage its exposure to changes in fair value on these instruments attributable to changes in the designated benchmark interest rate, LIBOR. Interest rate swaps designated as fair value hedges involve the payment of fixed-rate amounts to a counterparty in exchange for the Company receiving variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. 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 interest income. The table below presents the effect of the Company’s derivative financial instruments designated as hedging instruments on the Consolidated Statements of Income for the three and six months ended June 30, 2018 and June 30, 2017 : Location and Amount of Gain or Loss Recognized in Income on Fair Value Hedging Relationships For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 (in thousands) Interest Income (Expense) Other Gain (Loss) Interest Income (Expense) Other Gain (Loss) Interest Income (Expense) Other Gain (Loss) Interest Income (Expense) Other Gain (Loss) Total amounts of income and expense line items presented in the Consolidated Statements of Income in which the effects of fair value hedges are recorded $ (1 ) $ — $ — $ — $ (1 ) $ — $ — $ — The effects of fair value hedging: Loss on fair value hedging relationships in subtopic 815-20: Interest contracts: Hedged items 135 — — — 135 — — — Derivative designated as hedging instruments (136 ) — — — (136 ) — — — As of June 30, 2018 , the following amounts were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges: Line Item in the Balance Sheet in Which the Hedged Item is Included Carrying Amount of the Hedged Assets Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset (in thousands) Loans $ 5,630 $ 25 Derivatives Not Designated as Hedging Instruments The Company enters into interest rate derivatives, including interest rate swaps with its customers, to allow them to hedge against the risk of rising interest rates by providing fixed rate loans. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored interest rate contracts with institutional counterparties, with one designated as a central counterparty. As of June 30, 2018 , the total amount of interest rate swaps, including mirrored transactions with institutional counterparties and the Company’s customers, totaled $5.4 million for derivatives that were in an asset valuation position, and $5.4 million for derivatives that were in a liability valuation position. As of December 31, 2017 , the total notional amounts of interest rate swaps, including mirrored transactions with institutional counterparties and the Company’s customers, totaled zero for derivatives that were in an asset valuation position, and zero for derivatives that were in a liability valuation position. The fair value of interest rate swaps with institutional counterparties and the Company’s customers amounted to a $0.1 million asset and a $0.1 million liability, as of June 30, 2018 . The fair value of interest rate swaps with institutional counterparties and the Company’s customers amounted to a zero asset and a zero liability, as of December 31, 2017 . The following table presents the net gains (losses) recognized on the Consolidated Statements of Income related to the derivatives not designated as hedging instruments for the three and six months ended June 30, 2018 and June 30, 2017 : Location in the Consolidated Statements of Income For the Three Months Ended June 30, For the Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Interest rate swaps Other gain (loss) $ (19 ) $ — $ (19 ) $ — Offsetting of Derivatives The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company’s derivatives as of June 30, 2018 and December 31, 2017 . The net amounts of derivative assets or liabilities can be reconciled to the tabular disclosure of fair value. The tabular disclosure of fair value provides the location that derivative assets and liabilities are presented on the Consolidated Balance Sheets. Gross Amounts Not Offset in the Balance Sheet (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Balance Sheet Net Amounts of Assets (Liabilities) presented in the Balance Sheet Financial Instruments Cash Collateral Received (Paid) Net Assets (Liabilities) As of June 30, 2018 Asset Derivatives $ 113 $ — $ 113 $ — $ — $ 113 Liability Derivatives (158 ) — (158 ) — — (158 ) As of December 31, 2017 Derivatives — — — — — — Liability Derivatives — — — — — — Credit-risk-related Contingent Features The Company has an unsecured federal funds line with its derivative counterparty.The Company has an agreement with its derivative counterparty that contains a provision under which if the Company defaults on any of its indebtedness, 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 an agreement with its derivative counterparty that contains a provision under which the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company's default on the indebtedness. As of June 30, 2018 , the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $163,000 . As of June 30, 2018 , the Company has minimum collateral posting thresholds with certain of its derivative counterparties, and has not posted any collateral related to these agreements. If the Company had breached any of these provisions at June 30, 2018 , it could have been required to settle its obligations under the agreements at their termination value of $163,000

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	Goodwill and Intangible Assets The excess of the cost of an acquisition over the fair value of the net assets acquired, including core deposit, trade name, and client relationship intangibles, consists of goodwill. Under ASC Topic 350, goodwill and the non-amortizing portion of the trade name intangible are subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill and the non-amortizing portion of the trade name intangible at the reporting unit level to determine potential impairment annually on October 1, or more frequently if events or changes in circumstances indicate that the carrying value may not be recoverable, by comparing the carrying value of the reporting unit with the fair value of the reporting unit. No impairment was recorded on either the goodwill or the trade name intangible assets during the six months ended June 30, 2018 . The carrying amount of goodwill was $64.7 million at June 30, 2018 , the same as at December 31, 2017 . During the second quarter of 2018, the Company recognized a $125,000 customer list intangible due to the purchase of a registered investment adviser in the Denver, Colorado, area. The following table presents the changes in the carrying amount of intangibles (excluding goodwill), gross carrying amount, accumulated amortization, and net book value as of and for the six months ended June 30, 2018 : (in thousands) Insurance Agency Intangible Core Deposit Intangible Indefinite-Lived Trade Name Intangible Finite-Lived Trade Name Intangible Customer List Intangible Total June 30, 2018 Balance, beginning of period $ 148 $ 4,011 $ 7,040 $ 744 $ 103 $ 12,046 Finite-lived intangible assets acquired — — — — 125 125 Amortization expense (19 ) (1,119 ) — (97 ) (11 ) (1,246 ) Balance at end of period $ 129 $ 2,892 $ 7,040 $ 647 $ 217 $ 10,925 Gross carrying amount $ 1,320 $ 18,206 $ 7,040 $ 1,380 $ 455 $ 28,401 Accumulated amortization (1,191 ) (15,314 ) — (733 ) (238 ) (17,476 ) Net book value $ 129 $ 2,892 $ 7,040 $ 647 $ 217 $ 10,925

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2018
Other Assets [Abstract]
Other Assets Disclosure [Text Block]	Other Assets The components of the Company’s other assets were as follows: (in thousands) June 30, 2018 December 31, 2017 Federal Home Loan Bank Stock $ 14,748 $ 11,324 Prepaid expenses 1,954 2,992 Mortgage servicing rights 2,589 2,316 Federal & state income taxes receivable, current — 3,120 Accounts receivable & other miscellaneous assets 7,722 3,009 $ 27,013 $ 22,761 The Bank is a member of the FHLB of Des Moines, and ownership of FHLB stock is a requirement for such membership. The amount of FHLB stock the Bank is required to hold is directly related to the amount of FHLB advances borrowed. Because this security is not readily marketable and there are no available market values, this security is carried at cost and evaluated for potential impairment each quarter. Redemption of this investment is at the option of the FHLB. No impairment was recorded on FHLB stock in the six months ended June 30, 2018 or in the year ended December 31, 2017 .

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2018
Short-term Debt [Abstract]
Short-term Debt [Text Block]	Short-Term Borrowings Short-term borrowings were as follows as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Weighted Average Cost Balance Weighted Average Cost Balance Federal funds purchased 2.10 % $ 52,421 1.77 % $ 1,000 Securities sold under agreements to repurchase 0.91 75,046 0.71 96,229 Total 1.40 % $ 127,467 0.73 % $ 97,229 At June 30, 2018 and December 31, 2017 , the Company had no borrowings through the Federal Reserve Discount Window, while the borrowing capacity was $11.4 million as of June 30, 2018 and December 31, 2017 . As of June 30, 2018 and December 31, 2017 , the Bank had municipal securities pledged with a market value of $12.7 million and $12.8 million , respectively, to the Federal Reserve to secure potential borrowings. The Company also has various other unsecured federal funds agreements with correspondent banks as well as the FHLB. As of June 30, 2018 and December 31, 2017 , there were $52.4 million and $1.0 million of borrowings through these correspondent bank federal funds agreements, respectively. Securities sold under agreements to repurchase are agreements in which the Company acquires funds by selling assets to another party under a simultaneous agreement to repurchase the same assets at a specified price and date. The Company enters into repurchase agreements and also offers a demand deposit account product to customers that sweeps their balances in excess of an agreed upon target amount into overnight repurchase agreements. All securities sold under agreements to repurchase are recorded on the face of the balance sheet. On April 30, 2015 , the Company entered into a $5.0 million unsecured line of credit with a correspondent bank. Interest is payable at a rate of one-month LIBOR plus 2.00% . The line was renewed in May 2018, and matures on April 30, 2019 . The Company had no balance outstanding under this agreement as of June 30, 2018

Junior Subordinated Notes Issue

Junior Subordinated Notes Issued to Capital Trusts	6 Months Ended
	Jun. 30, 2018
Junior Subordinated Notes [Abstract]
Subordinated Borrowings Disclosure [Text Block]	The Company has established three statutory business trusts under the laws of the state of Delaware: Central Bancshares Capital Trust II, Barron Investment Capital Trust I, and MidWestOne Statutory Trust II. The trusts exist for the exclusive purposes of (i) issuing trust securities representing undivided beneficial interests in the assets of the respective trust; (ii) investing the gross proceeds of the trust securities in junior subordinated deferrable interest debentures (junior subordinated notes); and (iii) engaging in only those activities necessary or incidental thereto. For regulatory capital purposes, these trust securities qualify as a component of Tier 1 capital. The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of June 30, 2018 and December 31, 2017 : Face Value Book Value Interest Rate Interest Rate at Maturity Date Callable Date (in thousands) 6/30/2018 June 30, 2018 Central Bancshares Capital Trust II (1) (2) $ 7,217 $ 6,702 Three-month LIBOR + 3.50% 5.84 % 03/15/2038 03/15/2013 Barron Investment Capital Trust I (1) (2) 2,062 1,675 Three-month LIBOR + 2.15% 4.49 % 09/23/2036 09/23/2011 MidWestOne Statutory Trust II (1) 15,464 15,464 Three-month LIBOR + 1.59% 3.93 % 12/15/2037 12/15/2012 Total $ 24,743 $ 23,841 Face Value Book Value Interest Rate Interest Rate at Maturity Date Callable Date (in thousands) 12/31/2017 December 31, 2017 Central Bancshares Capital Trust II (1) (2) $ 7,217 $ 6,674 Three-month LIBOR + 3.50% 5.09 % 03/15/2038 03/15/2013 Barron Investment Capital Trust I (1) (2) 2,062 1,655 Three-month LIBOR + 2.15% 3.82 % 09/23/2036 09/23/2011 MidWestOne Statutory Trust II (1) 15,464 15,464 Three-month LIBOR + 1.59% 3.18 % 12/15/2037 12/15/2012 Total $ 24,743 $ 23,793 (1) All distributions are cumulative and paid in cash quarterly. (2) Central Bancshares Capital Trust II and Barron Investment Capital Trust I were established by Central prior to the Company’s merger with Central, and the junior subordinated notes issued by Central were assumed by the Company. The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at the stated maturity date or upon redemption of the junior subordinated notes. Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated notes. The Company’s obligation under the junior subordinated notes and other relevant trust agreements, in aggregate, constitutes a full and unconditional guarantee by the Company of each trust’s obligations under the trust preferred securities issued by each trust. The Company has the right to defer payment of interest on the junior subordinated notes and, therefore, distributions on the trust preferred securities, for up to five years , but not beyond the stated maturity date in the table above. During any such deferral period the Company may not pay cash dividends on its stock and generally may not repurchase its stock.

Federal Home Loan Bank Borrowin

Federal Home Loan Bank Borrowings and Long-Term Debt	6 Months Ended
	Jun. 30, 2018
Long-term Debt, by Type, Current and Noncurrent [Abstract]
Long-term Debt [Text Block]	Long-Term Debt Federal Home Loan Bank borrowings and long-term debt were as follows as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Weighted Average Cost Balance Weighted Average Cost Balance FHLB Borrowings 2.12 % $ 143,000 1.72 % $ 115,000 Note payable to unaffiliated bank 3.75 10,000 3.32 12,500 Total 2.23 % $ 153,000 1.88 % $ 127,500 The Company utilizes FHLB borrowings as a supplement to customer deposits to fund interest-earning assets and to assist in managing interest rate risk. As a member of the Federal Home Loan Bank of Des Moines, the Bank may borrow funds from the FHLB in amounts up to 35% of the Bank’s total assets, provided the Bank is able to pledge an adequate amount of qualified assets to secure the borrowings. Advances from the FHLB are collateralized primarily by one- to four-family residential, commercial and agricultural real estate first mortgages equal to various percentages of the total outstanding notes. See Note 4 “Loans Receivable and the Allowance for Loan Losses” of the notes to the consolidated financial statements. On April 30, 2015 , the Company entered into a $35.0 million unsecured note payable with a correspondent bank with a maturity date of June 30, 2020 . The Company drew $25.0 million on the note prior to June 30, 2015, at which time the ability to obtain additional advances ceased. Payments of principal and interest are payable quarterly , which began on September 30, 2015 . As of June 30, 2018 , $10.0 million

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes Income tax expense for the three and six months ended June 30, 2018 and 2017 was less than the amount computed by applying the maximum effective federal income tax rate of 21% and 35% , respectively, to the income before income taxes, because of the following items: For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 (in thousands) Amount % of Pretax Income Amount % of Pretax Income Amount % of Pretax Income Amount % of Pretax Income Income tax based on statutory rate $ 2,160 21.0 % $ 3,629 35.0 % $ 4,213 21.0 % $ 6,864 35.0 % Tax-exempt interest (501 ) (4.9 ) (795 ) (7.7 ) (991 ) (4.9 ) (1,581 ) (8.1 ) Bank-owned life insurance (82 ) (0.8 ) (110 ) (1.1 ) (173 ) (0.9 ) (225 ) (1.1 ) State income taxes, net of federal income tax benefit 566 5.5 443 4.3 1,095 5.4 848 4.3 General business credits 7 (1.0 ) (19 ) (0.2 ) (40 ) (0.7 ) (40 ) (0.2 ) Other (19 ) 0.9 (12 ) (0.1 ) 11 0.6 (201 ) (1.0 ) Total income tax expense $ 2,131 20.7 % $ 3,136 30.2 % $ 4,115 20.5 % $ 5,665 28.9 %

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share Disclosure [Text Block]	Earnings per Share Basic per-share amounts are computed by dividing net income (the numerator) by the weighted-average number of common shares outstanding (the denominator). Diluted per-share amounts assume issuance of all common stock issuable upon conversion or exercise of other securities, unless the effect is to reduce the loss or increase the income per common share from continuing operations. The following table presents the computation of earnings per common share for the respective periods: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands, except per share amounts) 2018 2017 2018 2017 Basic earnings per common share computation Numerator: Net income $ 8,156 $ 7,234 $ 15,949 $ 13,947 Denominator: Weighted average shares outstanding 12,218,240 12,200,689 12,220,453 11,855,108 Basic earnings per common share $ 0.67 $ 0.59 $ 1.31 $ 1.18 Diluted earnings per common share computation Numerator: Net income $ 8,156 $ 7,234 $ 15,949 $ 13,947 Denominator: Weighted average shares outstanding, including all dilutive potential shares 12,229,940 12,219,238 12,235,405 11,878,315 Diluted earnings per common share $ 0.67 $ 0.59 $ 1.30 $ 1.17

Estimated Fair Value of Financi

Estimated Fair Value of Financial Instruments and Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Estimated Fair Value of Financial Instruments and Fair Value Measurements Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Market participants are defined as buyers and sellers in the principal (or most advantageous) market for the asset or liability that have all of the following characteristics: 1) an unrelated party; 2) knowledgeable (having a reasonable understanding about the asset or liability and the transaction based on all available information; including information that might be obtained through due diligence efforts that are usual or customary); 3) able to transact; and 4) willing to transact (motivated but not forced or otherwise compelled to do so). The FASB states “valuation techniques that are appropriate in the circumstances and for which sufficient data are available shall be used to measure fair value.” The valuation techniques for measuring fair value are consistent with the three traditional approaches to value: the market approach, the income approach, and the cost or asset approach. In applying valuation techniques, the use of relevant inputs (both observable and unobservable) based on the facts and circumstances must be used. The FASB has defined a fair value hierarchy for these inputs which prioritizes the inputs into three broad levels: • Level 1 Inputs – Quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 Inputs – Inputs other than quoted prices within Level 1 that are observable for assets or liabilities, either directly or indirectly. • Level 3 Inputs – Unobservable inputs for the asset or liability. Unobservable inputs should be used only to the extent that relevant observable inputs are not available; this allows for situations where there is little, if any, market activity for the asset or liability at the measurement date. Unobservable inputs should reflect the reporting entity’s own assumptions about the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk. It is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. The Company is required to use observable inputs, to the extent available, in the fair value estimation process unless that data results from forced liquidations or distressed sales. The Company used the following methods and significant assumptions to estimate fair value: Investment Securities - The fair value for investment securities are determined by quoted market prices, if available (Level 1). The Company utilizes an independent pricing service to obtain the fair value of debt securities. On a quarterly basis, the Company selects a sample of 30 securities from its primary pricing service and compares them to a secondary independent pricing service to validate value. In addition, the Company periodically reviews the pricing methodology utilized by the primary independent service for reasonableness. Debt securities issued by the U.S. Treasury and other U.S. Government agencies and corporations, mortgage-backed securities, and collateralized mortgage obligations are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace (Level 2). Municipal securities are valued using a type of matrix, or grid, pricing in which securities are benchmarked against the treasury rate based on credit rating (Level 2). On an annual basis, a group of selected municipal securities have their credit rating evaluated by a securities dealer and that information is used to verify the primary independent service’s rating and pricing. Loans Held for Sale - Loans held for sale are carried at the lower of cost or fair value, with fair value being based on binding contracts from third party investors (Level 2). The portfolio has historically consisted primarily of residential real estate loans. Loans, Net - The estimated fair value of loans, net, was performed using the income approach, with the market approach used for certain nonperforming loans, resulting in a Level 3 fair value classification. The application of the income approach establishes value by methods that discount or capitalize earnings and/or cash flow, by a discount or capitalization rate that reflects market rate of return expectations, market conditions, and the relative risk of the investment. Generally, this can be accomplished by the discounted cash flow method. For loans that exhibited some characteristics of performance and where it appears that the borrower may have adequate cash flows to service the loan, a discounted cash flow analysis was used. The discounted cash flow analysis was based on the contractual maturity of the loan and market indications of rates, prepayment speeds, defaults and credit risk. For loans with balloon or interest only payment structures, the repayment was extended by assuming a renewal period beyond the current contractual maturity date. For loans analyzed using the asset approach, the fair value was determined based on the estimated values of the underlying collateral. For impaired loans, the estimated net sales proceeds was used to determine the fair value of the loans when deemed appropriate. The implied sales proceeds value provides a better indication of value than the income stream as these loans are not performing or exhibit strong signs indicative of nonperformance. Collateral Dependent Impaired Loans - From time to time, a loan is considered impaired and an allowance for credit losses is established. The specific reserves for collateral dependent impaired loans are based on the fair value of the collateral less estimated costs to sell, based on appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and collateral underlying such loans, and resulted in a Level 3 classification for inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of valuation, and management’s expertise and knowledge of the client and the client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted in accordance with the allowance policy. Other Real Estate Owned (“OREO”) - OREO represents property acquired through foreclosures and settlements of loans. Property acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. These assets are subsequently accounted for at the lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals which are updated no less frequently than every 18 months. These appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and the collateral underlying such loans, resulting in a Level 3 classification for inputs for determining fair value. Real estate owned properties are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Appraisals for both collateral dependent impaired loans and OREO are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. Once received, a member of the Special Assets Department reviews the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. Interest Rate Swaps - Interest rate swaps are valued by the Company's swap dealers using cash flow valuation techniques with observable market data inputs. The fair values estimated by the Company's swap dealers use interest rates that are observable or that can be corroborated by observable market data and, therefore, are classified within Level 2 of the valuation hierarchy. The Company has entered into collateral agreements with its swap dealers which entitle it to receive collateral to cover market values on derivatives which are in asset position, thus a credit risk adjustment on interest rate swaps is not warranted. The following table summarizes assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 . The assets and liabilities are segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value: Fair Value Measurement at June 30, 2018 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Available for sale debt securities: U.S. Government agencies and corporations $ 5,543 $ — $ 5,543 $ — State and political subdivisions 141,715 — 141,715 — Mortgage-backed securities 54,370 — 54,370 — Collateralized mortgage obligations 172,010 — 172,010 — Corporate debt securities 64,674 — 64,674 — Total available for sale debt securities $ 438,312 $ — $ 438,312 $ — Derivatives $ 113 $ — $ 113 $ — Liabilities: Derivatives $ 158 $ — $ 158 $ — Fair Value Measurement at December 31, 2017 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Available for sale debt securities: U.S. Government agencies and corporations $ 15,626 $ — $ 15,626 $ — State and political subdivisions 141,839 — 141,839 — Mortgage-backed securities 48,497 — 48,497 — Collateralized mortgage obligations 168,196 — 168,196 — Corporate debt securities 71,166 — 71,166 — Total available for sale debt securities $ 445,324 $ — $ 445,324 $ — There were no transfers of assets between Level 3 of the fair value hierarchy during the three and six months ended June 30, 2018 or the year ended December 31, 2017 . Changes in the fair value of available for sale debt securities are included in other comprehensive income, and changes in the fair value of equity securities are included in noninterest income. The following table discloses the Company’s estimated fair value amounts of its assets recorded at fair value on a nonrecurring basis. It is management’s belief that the fair values presented below are reasonable based on the valuation techniques and data available to the Company as of June 30, 2018 and December 31, 2017 , as more fully described above. Fair Value Measurement at June 30, 2018 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Collateral dependent impaired loans $ 6,169 $ — $ — $ 6,169 Other real estate owned $ 676 $ — $ — $ 676 Fair Value Measurement at December 31, 2017 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Collateral dependent impaired loans $ 3,927 $ — $ — $ 3,927 Other real estate owned $ 2,010 $ — $ — $ 2,010 The following presents the valuation technique(s), unobservable inputs, and quantitative information about the unobservable inputs used for fair value measurements of the financial instruments held by the Company at June 30, 2018 , categorized within Level 3 of the fair value hierarchy: Quantitative Information About Level 3 Fair Value Measurements (dollars in thousands) Fair Value at June 30, 2018 Valuation Techniques(s) Unobservable Input Range of Inputs Weighted Average Collateral dependent impaired loans $ 6,169 Modified appraised value Third party appraisal NM * - NM * NM * Appraisal discount NM * - NM * NM * Other real estate owned $ 676 Modified appraised value Third party appraisal NM * - NM * NM * Appraisal discount NM * - NM * NM * * Not Meaningful. Third party appraisals are obtained as to the value of the underlying asset, but disclosure of this information would not provide meaningful information, as the range will vary widely from loan to loan. Types of discounts considered include age of the appraisal, local market conditions, current condition of the property, and estimated sales costs. These discounts will also vary from loan to loan, thus providing a range would not be meaningful. Due to the adoption of ASU 2016-01 as of January 1, 2018, the estimated fair value amounts shown for December 31, 2017 are not comparable to those for June 30, 2018 , due to a change in the required methodology (“exit price” only) for determining current estimated fair value. The carrying amount and estimated fair value of financial instruments not carried at fair value, at June 30, 2018 and December 31, 2017 are as follows: June 30, 2018 (in thousands) Carrying Amount Estimated Fair Value Quoted Significant Other Significant Financial assets: Cash and cash equivalents $ 43,264 $ 43,264 $ 43,264 $ — $ — Investment securities: Equity securities 2,809 2,809 2,809 — — Debt securities available for sale 438,312 438,312 — 438,312 — Debt securities held to maturity 192,896 188,407 — 188,407 — Total investment securities 634,017 629,528 2,809 626,719 — Loans held for sale 1,528 1,548 — 1,548 — Loans held for investment, net 2,333,235 2,268,777 — — 2,268,777 Interest receivable 13,636 13,636 13,636 — — Federal Home Loan Bank stock 14,748 14,748 — 14,748 — Derivative assets 113 113 — 113 — Financial liabilities: Deposits: Non-interest bearing demand 469,862 469,862 469,862 — — Interest-bearing checking 1,183,384 1,183,384 1,183,384 — — Savings 216,866 216,866 216,866 — — Certificates of deposit under $100,000 341,584 336,859 — 336,859 — Certificates of deposit $100,000 and over 392,505 388,913 — 388,913 — Total deposits 2,604,201 2,595,884 1,870,112 725,772 — Federal funds purchased and securities sold under agreements to repurchase 127,467 127,467 127,467 — — Federal Home Loan Bank borrowings 143,000 141,069 — 141,069 — Junior subordinated notes issued to capital trusts 23,841 21,032 — 21,032 — Long-term debt 10,000 10,000 — 10,000 — Derivative liabilities 158 158 — 158 — December 31, 2017 (in thousands) Carrying Amount Estimated Fair Value Quoted Prices in Markets for Significant Other Significant Financial assets: Cash and cash equivalents $ 50,972 $ 50,972 $ 50,972 $ — $ — Investment securities: Equity securities 2,336 2,336 2,336 — — Debt securities available for sale 445,324 445,324 — 445,324 — Debt securities held to maturity 195,619 194,343 — 194,343 — Total investment securities 643,279 642,003 2,336 639,667 — Loans held for sale 856 871 — — 871 Loans held for investment, net 2,258,636 2,256,726 — 2,256,726 — Interest receivable 14,732 14,732 14,732 — — Federal Home Loan Bank stock 11,324 11,324 — 11,324 — Financial liabilities: Deposits: Non-interest bearing demand 461,969 461,969 461,969 — — Interest-bearing checking 1,228,112 1,228,112 1,228,112 — — Savings 213,430 213,430 213,430 — — Certificates of deposit under $100,000 324,681 321,197 — 321,197 — Certificates of deposit $100,000 and over 377,127 374,685 — 374,685 — Total deposits 2,605,319 2,599,393 1,903,511 695,882 — Federal funds purchased and securities sold under agreements to repurchase 97,229 97,229 97,229 — — Federal Home Loan Bank borrowings 115,000 114,945 — 114,945 — Junior subordinated notes issued to capital trusts 23,793 19,702 — 19,702 — Long-term debt 12,500 12,500 — 12,500 —

Revenue Recognition (Notes)

Revenue Recognition (Notes)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue Recognition 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. “Effect of New Financial Accounting Standards,” 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, derivatives, and certain credit card fees are also not in scope of the new guidance. Topic 606 is applicable to noninterest revenue streams such as trust and asset management fees, service charges on deposit accounts, sales of other real estate, and debit card interchange fees. 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. Trust and Asset Management Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Company’s performance obligation is generally satisfied over time, and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Company does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and asset management customers. The Company’s performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Service Charges on Deposit Accounts Service charges on deposit accounts consist of account analysis fees (i.e., net fees earned on analyzed business and public checking accounts), monthly service fees, check orders, and other deposit account related fees. 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 customers’ accounts. Fees, Exchange, and Other Service Charges Fees, exchange, and other service charges are primarily comprised of debit and credit card income, ATM fees, merchant services income, and other service charges. Debit and credit card income is primarily comprised of interchange fees earned whenever the Company’s debit and credit 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 and credit card transactions, in addition to account management fees. Other service charges include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. The Company’s performance obligation for fees, exchange, and other service charges 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. Gains/Losses on Sales of OREO Gain or loss from the sale of OREO occurs when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Company finances the sale of OREO to the buyer, the Company assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Company adjusts the transaction price and related gain (loss) on sale if a significant financing component is present. OREO sales for the six months ended June 30, 2018 and June 30, 2017 were not financed by the Bank. Other Other noninterest income consists of other recurring revenue streams such as safe deposit box rental fees, and other miscellaneous revenue streams. Safe deposit box rental fees are charged to the customer on an annual basis and recognized upon receipt of payment. The Company determined that since rentals and renewals occur fairly consistently over time, revenue is recognized on a basis consistent with the duration of the performance obligation. Contract Balances A contract asset balance occurs when an entity performs a service for a customer before the customer 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 customer for which the entity has already received payment (or payment is due) from the customer. The Company’s noninterest revenue streams are largely based on transactional activity, or standard month-end revenue accruals such as asset management fees based on month-end market values. 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 customers, and therefore, does not experience significant contract balances. As of June 30, 2018 and December 31, 2017 , the Company did not have any significant contract balances. Contract Acquisition Costs

Operating Segments

Operating Segments	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Operating Segments The Company’s activities are considered to be a single industry segment for financial reporting purposes. The Company is engaged in the business of commercial and retail banking, investment management and insurance services with operations throughout central and eastern Iowa, the Twin Cities area of Minnesota and Wisconsin, Florida, and Denver,

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Management evaluated subsequent events through the date the consolidated financial statements were issued. Events or transactions occurring after June 30, 2018 , but prior to the date the consolidated financial statements were issued, that provided additional evidence about conditions that existed at June 30, 2018 have been recognized in the consolidated financial statements for the three and six months ended June 30, 2018 . Events or transactions that provided evidence about conditions that did not exist at June 30, 2018 , but arose before the consolidated financial statements were issued, have not been recognized in the consolidated financial statements for the three and six months ended June 30, 2018 . In late July 2018, the Company recorded a writedown of approximately $0.5 million due to classifying a former branch facility as held for sale. On July 17, 2018 , the board of directors of the Company declared a cash dividend of $0.195 per share payable on September 17, 2018 to shareholders of record as of the close of business on September 1, 2018

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Certain Loans and Debt Securities Acquired in Transfer, Recognizing Interest Income on Impaired Loans, Policy [Policy Text Block]	Purchased Loans Policy All purchased loans (nonimpaired and impaired) are initially measured at fair value as of the acquisition date in accordance with applicable authoritative accounting guidance. Credit discounts are included in the determination of fair value. An allowance for loan losses is not recorded at the acquisition date for loans purchased. Individual loans acquired through the completion of a transfer, including loans that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are referred to herein as “purchased credit impaired loans.” In determining the acquisition date fair value and estimated credit losses of purchased credit impaired loans, and in subsequent accounting, the Company accounts for loans individually. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as a yield adjustment or as a loss accrual or valuation allowance. Expected cash flows at the purchase date in excess of the fair value of loans, if any, are recorded as interest income over the expected life of the loans if the timing and amount of future cash flows are reasonably estimable. Subsequent to the purchase date, increases in cash flows over those expected at the purchase date are recognized as interest income prospectively. The present value of any decreases in expected cash flows after the purchase date is recognized by recording an allowance for loan losses and a provision for loan losses. If the Company does not have the information necessary to reasonably estimate cash flows to be expected, it may use the cost-recovery method or cash-basis method of income recognition.
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block]	Charge-off Policy The Company requires a loan to be charged-off, in whole or in part, as soon as it becomes apparent that some loss will be incurred, or when its collectability is sufficiently questionable that it no longer is considered a bankable asset. The primary considerations when determining if and how much of a loan should be charged-off are as follows: (1) the potential for future cash flows; (2) the value of any collateral; and (3) the strength of any co-makers or guarantors.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Loan and Lease Losses The Company requires the maintenance of an adequate allowance for loan and lease losses (“ALLL”) in order to cover estimated probable losses without eroding the Company’s capital base. Calculations are done at each quarter end, or more frequently if warranted, to analyze the collectability of loans and to ensure the adequacy of the allowance. In line with FDIC directives, the ALLL calculation does not include consideration of loans held for sale or off-balance-sheet credit exposures (such as unfunded letters of credit). Determining the appropriate level for the ALLL relies on the informed judgment of management, and as such, is subject to inexactness. Given the inherently imprecise nature of calculating the necessary ALLL, the Company’s policy permits the actual ALLL to be between 20% above and 5% below the “indicated reserve.”
Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block]	Loans Reviewed Individually for Impairment The Company identifies loans to be reviewed and evaluated individually for impairment based on current information and events and the probability that the borrower will be unable to repay all amounts due according to the contractual terms of the loan agreement. Specific areas of consideration include: size of credit exposure, risk rating, delinquency, nonaccrual status, and loan classification. The level of individual impairment is measured using one of the following methods: (1) the fair value of the collateral less costs to sell; (2) the present value of expected future cash flows, discounted at the loan's effective interest rate; or (3) the loan's observable market price. Loans that are deemed fully collateralized or have been charged down to a level corresponding with any of the three measurements require no assignment of reserves from the ALLL. A loan modification is a change in an existing loan contract that has been agreed to by the borrower and the Bank, which may or may not be a troubled debt restructure or “TDR.” All loans deemed TDR are considered impaired. A loan is considered a TDR when, for economic or legal reasons related to a borrower’s financial difficulties, a concession is granted to the borrower that would not otherwise be considered. Both financial distress on the part of the borrower and the Bank’s granting of a concession, which are detailed further below, must be present in order for the loan to be considered a TDR. All of the following factors are indicators that the debtor is experiencing financial difficulties (one or more items may be present): • The debtor is currently in default on any of its debt. • The debtor has declared or is in the process of declaring bankruptcy. • There is significant doubt as to whether the debtor will continue to be a going concern. • Currently, the debtor has securities being held as collateral that have been delisted, are in the process of being delisted, or are under threat of being delisted from an exchange. • Based on estimates and projections that only encompass the current business capabilities, the debtor forecasts that its entity-specific cash flows will be insufficient to service the debt (both interest and principal) in accordance with the contractual terms of the existing agreement through maturity. • Absent the current modification, the debtor cannot obtain funds from sources other than the existing creditors at an effective interest rate equal to the current market interest rate for similar debt for a non-troubled debtor. The following factors are potential indicators that a concession has been granted (one or multiple items may be present): • The borrower receives a reduction of the stated interest rate for the remaining original life of the debt. • The borrower receives an extension of the maturity date or dates at a stated interest rate lower that the current market interest rate for new debt with similar risk characteristics. • The borrower receives a reduction of the face amount or maturity amount of the debt as stated in the instrument or other agreement. • The borrower receives a deferral of required payments (principal and/or interest). •
Loans and Leases Receivable, Past Due Status, Policy [Policy Text Block]	Non-accrual and Delinquent Loans Loans are placed on non-accrual when (1) payment in full of principal and interest is no longer expected or (2) principal or interest has been in default for 90 days or more (unless the loan is both well secured with marketable collateral and in the process of collection). All loans rated doubtful or worse, and certain loans rated substandard, are placed on non-accrual. A non-accrual asset may be restored to an accrual status when (1) all past due principal and interest has been paid (excluding renewals and modifications that involve the capitalizing of interest) or (2) the loan becomes well secured with marketable collateral and is in the process of collection. An established track record of performance is also considered when determining accrual status.
Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block]	As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. The Company does not use derivatives for trading or speculative purposes.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Market participants are defined as buyers and sellers in the principal (or most advantageous) market for the asset or liability that have all of the following characteristics: 1) an unrelated party; 2) knowledgeable (having a reasonable understanding about the asset or liability and the transaction based on all available information; including information that might be obtained through due diligence efforts that are usual or customary); 3) able to transact; and 4) willing to transact (motivated but not forced or otherwise compelled to do so). The FASB states “valuation techniques that are appropriate in the circumstances and for which sufficient data are available shall be used to measure fair value.” The valuation techniques for measuring fair value are consistent with the three traditional approaches to value: the market approach, the income approach, and the cost or asset approach. In applying valuation techniques, the use of relevant inputs (both observable and unobservable) based on the facts and circumstances must be used. The FASB has defined a fair value hierarchy for these inputs which prioritizes the inputs into three broad levels: • Level 1 Inputs – Quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 Inputs – Inputs other than quoted prices within Level 1 that are observable for assets or liabilities, either directly or indirectly. • Level 3 Inputs – Unobservable inputs for the asset or liability. Unobservable inputs should be used only to the extent that relevant observable inputs are not available; this allows for situations where there is little, if any, market activity for the asset or liability at the measurement date. Unobservable inputs should reflect the reporting entity’s own assumptions about the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk.
Fair Value Measurement, Policy [Policy Text Block]	The Company used the following methods and significant assumptions to estimate fair value: Investment Securities - The fair value for investment securities are determined by quoted market prices, if available (Level 1). The Company utilizes an independent pricing service to obtain the fair value of debt securities. On a quarterly basis, the Company selects a sample of 30 securities from its primary pricing service and compares them to a secondary independent pricing service to validate value. In addition, the Company periodically reviews the pricing methodology utilized by the primary independent service for reasonableness. Debt securities issued by the U.S. Treasury and other U.S. Government agencies and corporations, mortgage-backed securities, and collateralized mortgage obligations are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace (Level 2). Municipal securities are valued using a type of matrix, or grid, pricing in which securities are benchmarked against the treasury rate based on credit rating (Level 2). On an annual basis, a group of selected municipal securities have their credit rating evaluated by a securities dealer and that information is used to verify the primary independent service’s rating and pricing. Loans Held for Sale - Loans held for sale are carried at the lower of cost or fair value, with fair value being based on binding contracts from third party investors (Level 2). The portfolio has historically consisted primarily of residential real estate loans. Loans, Net - The estimated fair value of loans, net, was performed using the income approach, with the market approach used for certain nonperforming loans, resulting in a Level 3 fair value classification. The application of the income approach establishes value by methods that discount or capitalize earnings and/or cash flow, by a discount or capitalization rate that reflects market rate of return expectations, market conditions, and the relative risk of the investment. Generally, this can be accomplished by the discounted cash flow method. For loans that exhibited some characteristics of performance and where it appears that the borrower may have adequate cash flows to service the loan, a discounted cash flow analysis was used. The discounted cash flow analysis was based on the contractual maturity of the loan and market indications of rates, prepayment speeds, defaults and credit risk. For loans with balloon or interest only payment structures, the repayment was extended by assuming a renewal period beyond the current contractual maturity date. For loans analyzed using the asset approach, the fair value was determined based on the estimated values of the underlying collateral. For impaired loans, the estimated net sales proceeds was used to determine the fair value of the loans when deemed appropriate. The implied sales proceeds value provides a better indication of value than the income stream as these loans are not performing or exhibit strong signs indicative of nonperformance. Collateral Dependent Impaired Loans - From time to time, a loan is considered impaired and an allowance for credit losses is established. The specific reserves for collateral dependent impaired loans are based on the fair value of the collateral less estimated costs to sell, based on appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and collateral underlying such loans, and resulted in a Level 3 classification for inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of valuation, and management’s expertise and knowledge of the client and the client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted in accordance with the allowance policy. Other Real Estate Owned (“OREO”) - OREO represents property acquired through foreclosures and settlements of loans. Property acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. These assets are subsequently accounted for at the lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals which are updated no less frequently than every 18 months. These appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available for similar loans and the collateral underlying such loans, resulting in a Level 3 classification for inputs for determining fair value. Real estate owned properties are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Appraisals for both collateral dependent impaired loans and OREO are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. Once received, a member of the Special Assets Department reviews the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. Interest Rate Swaps

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The amortized cost and fair value of debt securities available for sale, with gross unrealized gains and losses, were as follows: As of June 30, 2018 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government agencies and corporations $ 5,594 $ — $ 51 $ 5,543 State and political subdivisions 140,935 1,321 541 141,715 Mortgage-backed securities 55,864 128 1,622 54,370 Collateralized mortgage obligations 179,862 7 7,859 172,010 Corporate debt securities 66,080 17 1,423 64,674 Total $ 448,335 $ 1,473 $ 11,496 $ 438,312 As of December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government agencies and corporations $ 15,716 $ — $ 90 $ 15,626 State and political subdivisions 139,561 2,475 197 141,839 Mortgage-backed securities 48,744 181 428 48,497 Collateralized mortgage obligations 173,339 29 5,172 168,196 Corporate debt securities 71,562 31 427 71,166 Total $ 448,922 $ 2,716 $ 6,314 $ 445,324
Held-to-maturity Securities [Table Text Block]	The amortized cost and fair value of debt securities held to maturity, with gross unrealized gains and losses, were as follows: As of June 30, 2018 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value State and political subdivisions $ 125,948 $ 289 $ 3,063 $ 123,174 Mortgage-backed securities 11,586 2 472 11,116 Collateralized mortgage obligations 20,243 — 1,020 19,223 Corporate debt securities 35,119 264 489 34,894 Total $ 192,896 $ 555 $ 5,044 $ 188,407 As of December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government agencies and corporations $ 10,049 $ — $ — $ 10,049 State and political subdivisions 126,413 804 1,631 125,586 Mortgage-backed securities 1,906 4 13 1,897 Collateralized mortgage obligations 22,115 — 707 21,408 Corporate debt securities 35,136 548 281 35,403 Total $ 195,619 $ 1,356 $ 2,632 $ 194,343
Schedule of Temporary Impairment Losses, Investments [Table Text Block]	The following tables present information pertaining to securities with gross unrealized losses as of June 30, 2018 and December 31, 2017 , aggregated by investment category and length of time that individual securities have been in a continuous loss position: As of June 30, 2018 Number of Securities Less than 12 Months 12 Months or More Total Available for Sale Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) U.S. Government agencies and corporations 2 $ 5,543 $ 51 $ — $ — $ 5,543 $ 51 State and political subdivisions 73 35,538 471 2,757 70 38,295 541 Mortgage-backed securities 27 53,518 1,447 6,176 175 59,694 1,622 Collateralized mortgage obligations 43 46,904 958 120,274 6,901 167,178 7,859 Corporate debt securities 12 54,441 1,183 8,440 240 62,881 1,423 Total 157 $ 195,944 $ 4,110 $ 137,647 $ 7,386 $ 333,591 $ 11,496 As of December 31, 2017 Number of Securities Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) U.S. Government agencies and corporations 3 $ 15,626 $ 90 $ — $ — $ 15,626 $ 90 State and political subdivisions 34 11,705 167 1,800 30 13,505 197 Mortgage-backed securities 20 37,964 359 3,961 69 41,925 428 Collateralized mortgage obligations 35 37,881 489 122,757 4,683 160,638 5,172 Corporate debt securities 12 55,340 298 8,778 129 64,118 427 Other equity securities 1 — — 1,944 56 1,944 56 Total 105 $ 158,516 $ 1,403 $ 139,240 $ 4,967 $ 297,756 $ 6,370 As of June 30, 2018 Number of Securities Less than 12 Months 12 Months or More Total Held to Maturity Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) State and political subdivisions 224 $ 49,218 $ 1,135 $ 27,690 $ 1,928 $ 76,908 $ 3,063 Mortgage-backed securities 6 10,203 438 841 34 11,044 472 Collateralized mortgage obligations 7 4,690 187 14,520 833 19,210 1,020 Corporate debt securities 7 12,882 318 2,724 171 15,606 489 Total 244 $ 76,993 $ 2,078 $ 45,775 $ 2,966 $ 122,768 $ 5,044 As of December 31, 2017 Number of Securities Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in thousands, except number of securities) State and political subdivisions 167 $ 33,237 $ 393 $ 25,843 $ 1,238 $ 59,080 $ 1,631 Mortgage-backed securities 4 349 2 887 11 1,236 13 Collateralized mortgage obligations 7 5,221 90 16,168 617 21,389 707 Corporate debt securities 3 3,093 4 2,617 277 5,710 281 Total 181 $ 41,900 $ 489 $ 45,515 $ 2,143 $ 87,415 $ 2,632
Investments Classified by Contractual Maturity Date [Table Text Block]	The contractual maturity distribution of investment debt securities at June 30, 2018 , is summarized as follows: Available For Sale Held to Maturity (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 39,542 $ 39,518 $ 520 $ 521 Due after one year through five years 107,415 106,371 23,357 23,016 Due after five years through ten years 62,298 62,685 94,804 93,529 Due after ten years 3,354 3,358 42,386 41,002 Debt securities without a single maturity date 235,726 226,380 31,829 30,339 Total $ 448,335 $ 438,312 $ 192,896 $ 188,407
Realized Gain (Loss) on Investments [Table Text Block]	Realized gains and losses on sales are determined on the basis of specific identification of investments based on the trade date. Realized gains (losses) on investments due to sale or call, including impairment losses for the three and six months ended June 30, 2018 and 2017 , were as follows: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Debt securities available for sale: Gross realized gains $ — $ 20 9 20 Gross realized gain $ — $ 20 $ 9 $ 20 Debt securities held to maturity: Gross realized gains $ — $ — $ — $ 43 Gross realized losses (4 ) — (4 ) — Gross realized gain (loss) $ (4 ) $ — $ (4 ) $ 43 The following tables present the net gains and losses on equity investments during the three and six months ended June 30, 2018 , disaggregated into realized and unrealized gains and losses: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2018 Net losses recognized $ (7 ) $ (23 ) Less: Net gains and losses recognized due to sales — — Unrealized losses on securities still held at the reporting date $ (7 ) $ (23 )

Loans Receivable and the Allo29

Loans Receivable and the Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The composition of allowance for loan losses and loans by portfolio segment and based on impairment method are as follows: Allowance for Loan Losses and Recorded Investment in Loan Receivables As of June 30, 2018 and December 31, 2017 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total June 30, 2018 Allowance for loan losses: Individually evaluated for impairment $ 287 $ 3,093 $ 3,950 $ 163 $ — $ 7,493 Collectively evaluated for impairment 2,369 5,464 12,053 2,353 256 22,495 Purchased credit impaired loans — — 338 474 — 812 Total $ 2,656 $ 8,557 $ 16,341 $ 2,990 $ 256 $ 30,800 Loans receivable Individually evaluated for impairment $ 8,056 $ 12,865 $ 20,477 $ 3,756 $ — $ 45,154 Collectively evaluated for impairment 95,373 499,438 1,209,911 459,045 36,936 2,300,703 Purchased credit impaired loans — 54 13,506 4,618 — 18,178 Total $ 103,429 $ 512,357 $ 1,243,894 $ 467,419 $ 36,936 $ 2,364,035 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total December 31, 2017 Allowance for loan losses: Individually evaluated for impairment $ 140 $ 1,126 $ 2,157 $ 226 $ — $ 3,649 Collectively evaluated for impairment 2,650 7,392 11,144 2,182 244 23,612 Purchased credit impaired loans — — 336 462 — 798 Total $ 2,790 $ 8,518 $ 13,637 $ 2,870 $ 244 $ 28,059 Loans receivable Individually evaluated for impairment $ 2,969 $ 9,734 $ 10,386 $ 3,722 $ — $ 26,811 Collectively evaluated for impairment 102,543 493,844 1,147,133 460,475 36,158 2,240,153 Purchased credit impaired loans — 46 14,452 5,233 — 19,731 Total $ 105,512 $ 503,624 $ 1,171,971 $ 469,430 $ 36,158 $ 2,286,695
Allowance for Credit Losses on Financing Receivables [Table Text Block]	The changes in the allowance for loan losses by portfolio segment were as follows: Allowance for Loan Loss Activity For the Three Months Ended June 30, 2018 and 2017 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total 2018 Beginning balance $ 3,153 $ 8,362 $ 14,997 $ 2,877 $ 282 $ 29,671 Charge-offs (268 ) (3 ) — (3 ) (17 ) (291 ) Recoveries 9 103 40 15 3 170 Provision (238 ) 95 1,304 101 (12 ) 1,250 Ending balance $ 2,656 $ 8,557 $ 16,341 $ 2,990 $ 256 $ 30,800 2017 Beginning balance $ 2,460 $ 6,021 $ 9,751 $ 3,764 $ 221 $ 22,217 Charge-offs (347 ) (464 ) (45 ) (52 ) (135 ) (1,043 ) Recoveries 4 83 5 — 4 96 Provision 549 2,319 (698 ) (1,062 ) 132 1,240 Ending balance $ 2,666 $ 7,959 $ 9,013 $ 2,650 $ 222 $ 22,510 Allowance for Loan Loss Activity For the Six Months Ended June 30, 2018 and 2017 (in thousands) Agricultural Commercial and Industrial Commercial Real Estate Residential Real Estate Consumer Total 2018 Beginning balance $ 2,790 $ 8,518 $ 13,637 $ 2,870 $ 244 $ 28,059 Charge-offs (268 ) (90 ) (264 ) (107 ) (38 ) (767 ) Recoveries 15 182 116 77 18 408 Provision 119 (53 ) 2,852 150 32 3,100 Ending balance $ 2,656 $ 8,557 $ 16,341 $ 2,990 $ 256 $ 30,800 2017 Beginning balance $ 2,003 $ 6,274 $ 9,860 $ 3,458 $ 255 $ 21,850 Charge-offs (884 ) (529 ) (106 ) (80 ) (160 ) (1,759 ) Recoveries 14 102 15 — 7 138 Provision 1,533 2,112 (756 ) (728 ) 120 2,281 Ending balance $ 2,666 $ 7,959 $ 9,013 $ 2,650 $ 222 $ 22,510
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	The following table sets forth information on the Company’s TDRs by class of loan occurring during the stated periods: Three Months Ended June 30, 2018 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (dollars in thousands) Troubled Debt Restructurings (1) : Commercial real estate: Farmland Extended maturity date 1 $ 86 $ 86 2 $ 176 $ 176 Commercial real estate-other Other — — — 1 10,546 10,923 Total 1 $ 86 $ 86 3 $ 10,722 $ 11,099 Six Months Ended June 30, 2018 2017 (dollars in thousands) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings (1) : Commercial and industrial Extended maturity date — $ — $ — 6 $ 2,037 $ 2,083 Commercial real estate: Farmland Extended maturity date 1 86 86 2 176 176 Commercial real estate-other Extended maturity date — — — 1 968 968 Other — — — 1 10,546 10,923 Total 1 $ 86 $ 86 10 $ 13,727 $ 14,150 (1) TDRs may include multiple concessions, and the disclosure classifications are based on the primary concession provided to the borrower. Loans by class modified as TDRs within 12 months of modification and for which there was a payment default during the stated periods were as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Troubled Debt Restructurings (1) That Subsequently Defaulted: Commercial and industrial Extended maturity date — $ — 1 $ 550 — $ — 4 $ 1,504 Commercial real estate: Commercial real estate-other Extended maturity date — — 1 968 1 2,657 1 968 Total — $ — 2 $ 1,518 1 $ 2,657 5 $ 2,472 (1) TDRs may include multiple concessions, and the disclosure classifications are based on the primary concession provided to the borrower.
Financing Receivable Credit Quality Indicators [Table Text Block]	The following tables set forth the risk category of loans by class of loans and credit quality indicator based on the most recent analysis performed, as of June 30, 2018 and December 31, 2017 : (in thousands) Pass Special Mention/ Watch Substandard Doubtful Loss Total June 30, 2018 Agricultural $ 76,987 $ 17,723 $ 8,719 $ — $ — $ 103,429 Commercial and industrial 473,717 21,118 17,517 5 — 512,357 Commercial real estate: Construction and development 203,880 1,216 1,173 — — 206,269 Farmland 70,237 8,514 10,010 — — 88,761 Multifamily 127,072 1,406 1,181 — — 129,659 Commercial real estate-other 754,866 45,300 19,039 — — 819,205 Total commercial real estate 1,156,055 56,436 31,403 — — 1,243,894 Residential real estate: One- to four- family first liens 340,610 3,104 6,567 — — 350,281 One- to four- family junior liens 115,160 706 1,272 — — 117,138 Total residential real estate 455,770 3,810 7,839 — — 467,419 Consumer 36,772 133 3 28 — 36,936 Total $ 2,199,301 $ 99,220 $ 65,481 $ 33 $ — $ 2,364,035 (in thousands) Pass Special Mention/ Watch Substandard Doubtful Loss Total December 31, 2017 Agricultural $ 80,377 $ 21,989 $ 3,146 $ — $ — $ 105,512 Commercial and industrial 453,363 23,153 27,102 6 — 503,624 Commercial real estate: Construction and development 162,968 1,061 1,247 — — 165,276 Farmland 76,740 10,357 771 — — 87,868 Multifamily 131,507 2,498 501 — — 134,506 Commercial real estate-other 731,231 34,056 19,034 — — 784,321 Total commercial real estate 1,102,446 47,972 21,553 — — 1,171,971 Residential real estate: One- to four- family first liens 340,446 2,776 9,004 — — 352,226 One- to four- family junior liens 114,763 952 1,489 — — 117,204 Total residential real estate 455,209 3,728 10,493 — — 469,430 Consumer 36,059 — 68 31 — 36,158 Total $ 2,127,454 $ 96,842 $ 62,362 $ 37 $ — $ 2,286,695
Impaired Financing Receivables [Table Text Block]	The following table presents loans individually evaluated for impairment, excluding purchased credit impaired loans, by class of loan, as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: Agricultural $ 6,307 $ 6,807 $ — $ 1,523 $ 2,023 $ — Commercial and industrial 4,162 4,528 — 7,588 7,963 — Commercial real estate: Construction and development 84 84 — 84 84 — Farmland 6,532 6,532 — 287 287 — Multifamily 823 823 — — — — Commercial real estate-other 6,602 7,111 — 5,746 6,251 — Total commercial real estate 14,041 14,550 — 6,117 6,622 — Residential real estate: One- to four- family first liens 2,488 2,540 — 2,449 2,482 — One- to four- family junior liens 302 302 — 26 26 — Total residential real estate 2,790 2,842 — 2,475 2,508 — Consumer — — — — — — Total $ 27,300 $ 28,727 $ — $ 17,703 $ 19,116 $ — With an allowance recorded: Agricultural $ 1,749 $ 1,754 $ 287 $ 1,446 $ 1,446 $ 140 Commercial and industrial 8,703 8,810 3,093 2,146 2,177 1,126 Commercial real estate: Construction and development — — — — — — Farmland 2,123 2,123 648 — — — Multifamily — — — — — — Commercial real estate-other 4,313 11,980 3,302 4,269 11,536 2,157 Total commercial real estate 6,436 14,103 3,950 4,269 11,536 2,157 Residential real estate: One- to four- family first liens 966 966 163 979 979 185 One- to four- family junior liens — — — 268 268 41 Total residential real estate 966 966 163 1,247 1,247 226 Consumer — — — — — — Total $ 17,854 $ 25,633 $ 7,493 $ 9,108 $ 16,406 $ 3,649 Total: Agricultural $ 8,056 $ 8,561 $ 287 $ 2,969 $ 3,469 $ 140 Commercial and industrial 12,865 13,338 3,093 9,734 10,140 1,126 Commercial real estate: Construction and development 84 84 — 84 84 — Farmland 8,655 8,655 648 287 287 — Multifamily 823 823 — — — — Commercial real estate-other 10,915 19,091 3,302 10,015 17,787 2,157 Total commercial real estate 20,477 28,653 3,950 10,386 18,158 2,157 Residential real estate: One- to four- family first liens 3,454 3,506 163 3,428 3,461 185 One- to four- family junior liens 302 302 — 294 294 41 Total residential real estate 3,756 3,808 163 3,722 3,755 226 Consumer — — — — — — Total $ 45,154 $ 54,360 $ 7,493 $ 26,811 $ 35,522 $ 3,649 The following table presents the average recorded investment and interest income recognized for loans individually evaluated for impairment, excluding purchased credit impaired loans, by class of loan, during the stated periods: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Agricultural $ 6,037 $ 296 $ 1,192 $ 66 $ 4,422 $ 363 $ 1,216 $ 79 Commercial and industrial 3,954 98 4,787 67 3,465 144 4,143 90 Commercial real estate: Construction and development 84 — 360 — 84 — 360 — Farmland 5,242 185 1,686 36 3,494 234 2,073 69 Multifamily 825 20 — — 550 30 — — Commercial real estate-other 5,693 130 3,118 71 5,394 177 3,040 103 Total commercial real estate 11,844 335 5,164 107 9,522 441 5,473 172 Residential real estate: One- to four- family first liens 2,438 20 2,409 46 1,757 11 2,417 70 One- to four- family junior liens 297 — 13 — 288 — 13 — Total residential real estate 2,735 20 2,422 46 2,045 11 2,430 70 Consumer — — — — — — — — Total $ 24,570 $ 749 $ 13,565 $ 286 $ 19,454 $ 959 $ 13,262 $ 411 With an allowance recorded: Agricultural $ 1,622 $ 57 $ 1,855 $ 53 $ 1,610 $ 71 $ 1,875 $ 67 Commercial and industrial 7,797 53 4,444 14 7,457 37 3,495 37 Commercial real estate: Construction and development — — 809 — — — 832 — Farmland 2,107 26 — — 1,405 54 — — Multifamily — — — — — — — — Commercial real estate-other 4,360 — 6,294 16 4,586 — 4,410 — Total commercial real estate 6,467 26 7,103 16 5,991 54 5,242 — Residential real estate: One- to four- family first liens 969 18 1,372 17 972 27 1,389 26 One- to four- family junior liens — — — — — — — — Total residential real estate 969 18 1,372 17 972 27 1,389 26 Consumer — — — — — — — — Total $ 16,855 $ 154 $ 14,774 $ 100 $ 16,030 $ 189 $ 12,001 $ 130 Total: Agricultural $ 7,659 $ 353 $ 3,047 $ 119 $ 6,032 $ 434 $ 3,091 $ 146 Commercial and industrial 11,751 151 9,231 81 10,922 181 7,638 127 Commercial real estate: Construction and development 84 — 1,169 — 84 — 1,192 — Farmland 7,349 211 1,686 36 4,899 288 2,073 69 Multifamily 825 20 — — 550 30 — — Commercial real estate-other 10,053 130 9,412 87 9,980 177 7,450 103 Total commercial real estate 18,311 361 12,267 123 15,513 495 10,715 172 Residential real estate: One- to four- family first liens 3,407 38 3,781 63 2,729 38 3,806 96 One- to four- family junior liens 297 — 13 — 288 — 13 — Total residential real estate 3,704 38 3,794 63 3,017 38 3,819 96 Consumer — — — — — — — — Total $ 41,425 $ 903 $ 28,339 $ 386 $ 35,484 $ 1,148 $ 25,263 $ 541
Past Due Financing Receivables [Table Text Block]	The following table presents the contractual aging of the recorded investment in past due loans by class of loans at June 30, 2018 and December 31, 2017 : (in thousands) 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable June 30, 2018 Agricultural $ 503 $ — $ 280 $ 783 $ 102,646 $ 103,429 Commercial and industrial 1,144 185 6,006 7,335 505,022 512,357 Commercial real estate: Construction and development 11 — 83 94 206,175 206,269 Farmland 515 — 141 656 88,105 88,761 Multifamily — — — — 129,659 129,659 Commercial real estate-other 189 62 3,646 3,897 815,308 819,205 Total commercial real estate 715 62 3,870 4,647 1,239,247 1,243,894 Residential real estate: One- to four- family first liens 1,412 1,170 872 3,454 346,827 350,281 One- to four- family junior liens 120 67 440 627 116,511 117,138 Total residential real estate 1,532 1,237 1,312 4,081 463,338 467,419 Consumer 56 23 19 98 36,838 36,936 Total $ 3,950 $ 1,507 $ 11,487 $ 16,944 $ 2,347,091 $ 2,364,035 Included in the totals above are the following purchased credit impaired loans $ 203 $ 160 $ — $ 363 $ 17,815 $ 18,178 December 31, 2017 Agricultural $ 95 $ 118 $ 168 $ 381 $ 105,131 $ 105,512 Commercial and industrial 1,434 1,336 1,576 4,346 499,278 503,624 Commercial real estate: Construction and development 57 97 82 236 165,040 165,276 Farmland 217 — 373 590 87,278 87,868 Multifamily — 25 — 25 134,481 134,506 Commercial real estate-other 74 — 1,852 1,926 782,395 784,321 Total commercial real estate 348 122 2,307 2,777 1,169,194 1,171,971 Residential real estate: One- to four- family first liens 3,854 756 1,019 5,629 346,597 352,226 One- to four- family junior liens 325 770 271 1,366 115,838 117,204 Total residential real estate 4,179 1,526 1,290 6,995 462,435 469,430 Consumer 79 15 29 123 36,035 36,158 Total $ 6,135 $ 3,117 $ 5,370 $ 14,622 $ 2,272,073 $ 2,286,695 Included in the totals above are the following purchased credit impaired loans $ 164 $ 756 $ 553 $ 1,473 $ 18,258 $ 19,731
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	The following table sets forth the composition of the Company’s recorded investment in loans on nonaccrual status and past due 90 days or more and still accruing by class of loans, excluding purchased credit impaired loans, as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Non-Accrual Loans Past Due 90 Days or More and Still Accruing Non-Accrual Loans Past Due 90 Days or More and Still Accruing Agricultural $ 255 $ 52 $ 168 $ — Commercial and industrial 6,790 — 7,124 — Commercial real estate: Construction and development 102 — 188 — Farmland 278 — 386 — Multifamily — — — — Commercial real estate-other 4,001 — 5,279 — Total commercial real estate 4,381 — 5,853 — Residential real estate: One- to four- family first liens 1,085 60 1,228 205 One- to four- family junior liens 493 39 346 2 Total residential real estate 1,578 99 1,574 207 Consumer 63 — 65 — Total $ 13,067 $ 151 $ 14,784 $ 207
Schedule of Changes in Accretable Yield for Purchased Credit Impaired Loans [Table Text Block]	Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and six months ended June 30, 2018 and 2017 : Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Balance at beginning of period $ 608 $ 1,633 $ 840 $ 1,961 Accretion (373 ) (475 ) (650 ) (891 ) Reclassification from nonaccretable difference 76 213 121 301 Balance at end of period $ 311 $ 1,371 $ 311 $ 1,371

Derivatives and Hedging Activ30

Derivatives and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments [Table Text Block]	The following table presents the total notional and gross fair value of the Company’s derivatives as of June 30, 2018 and December 31, 2017 . The derivative asset and liability balances are presented on a gross basis, prior to the application of master netting agreements, as included in other assets and other liabilities, respectively, on the Consolidated Balance Sheets. As of June 30, 2018 As of December 31, 2017 Fair Value Fair Value (in thousands) Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Fair value hedges: Interest rate swaps $ 5,605 $ — $ 26 $ — $ — $ — Derivatives not designated as hedging instruments: Interest rate swaps 10,720 113 132 — — —
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]	The table below presents the effect of the Company’s derivative financial instruments designated as hedging instruments on the Consolidated Statements of Income for the three and six months ended June 30, 2018 and June 30, 2017 : Location and Amount of Gain or Loss Recognized in Income on Fair Value Hedging Relationships For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 (in thousands) Interest Income (Expense) Other Gain (Loss) Interest Income (Expense) Other Gain (Loss) Interest Income (Expense) Other Gain (Loss) Interest Income (Expense) Other Gain (Loss) Total amounts of income and expense line items presented in the Consolidated Statements of Income in which the effects of fair value hedges are recorded $ (1 ) $ — $ — $ — $ (1 ) $ — $ — $ — The effects of fair value hedging: Loss on fair value hedging relationships in subtopic 815-20: Interest contracts: Hedged items 135 — — — 135 — — — Derivative designated as hedging instruments (136 ) — — — (136 ) — — —
Hedged Items In Fair Value Hedging Relationship [Table Text Block]	As of June 30, 2018 , the following amounts were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges: Line Item in the Balance Sheet in Which the Hedged Item is Included Carrying Amount of the Hedged Assets Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset (in thousands) Loans $ 5,630 $ 25
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table presents the net gains (losses) recognized on the Consolidated Statements of Income related to the derivatives not designated as hedging instruments for the three and six months ended June 30, 2018 and June 30, 2017 : Location in the Consolidated Statements of Income For the Three Months Ended June 30, For the Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Interest rate swaps Other gain (loss) $ (19 ) $ — $ (19 ) $ —
Offsetting Derivative Assets And Liabilities [Table Text Block]	The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company’s derivatives as of June 30, 2018 and December 31, 2017 . The net amounts of derivative assets or liabilities can be reconciled to the tabular disclosure of fair value. The tabular disclosure of fair value provides the location that derivative assets and liabilities are presented on the Consolidated Balance Sheets. Gross Amounts Not Offset in the Balance Sheet (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Balance Sheet Net Amounts of Assets (Liabilities) presented in the Balance Sheet Financial Instruments Cash Collateral Received (Paid) Net Assets (Liabilities) As of June 30, 2018 Asset Derivatives $ 113 $ — $ 113 $ — $ — $ 113 Liability Derivatives (158 ) — (158 ) — — (158 ) As of December 31, 2017 Derivatives — — — — — — Liability Derivatives — — — — — —

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	The following table presents the changes in the carrying amount of intangibles (excluding goodwill), gross carrying amount, accumulated amortization, and net book value as of and for the six months ended June 30, 2018 : (in thousands) Insurance Agency Intangible Core Deposit Intangible Indefinite-Lived Trade Name Intangible Finite-Lived Trade Name Intangible Customer List Intangible Total June 30, 2018 Balance, beginning of period $ 148 $ 4,011 $ 7,040 $ 744 $ 103 $ 12,046 Finite-lived intangible assets acquired — — — — 125 125 Amortization expense (19 ) (1,119 ) — (97 ) (11 ) (1,246 ) Balance at end of period $ 129 $ 2,892 $ 7,040 $ 647 $ 217 $ 10,925 Gross carrying amount $ 1,320 $ 18,206 $ 7,040 $ 1,380 $ 455 $ 28,401 Accumulated amortization (1,191 ) (15,314 ) — (733 ) (238 ) (17,476 ) Net book value $ 129 $ 2,892 $ 7,040 $ 647 $ 217 $ 10,925

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Other Assets [Abstract]
Schedule of Other Assets [Table Text Block]	The components of the Company’s other assets were as follows: (in thousands) June 30, 2018 December 31, 2017 Federal Home Loan Bank Stock $ 14,748 $ 11,324 Prepaid expenses 1,954 2,992 Mortgage servicing rights 2,589 2,316 Federal & state income taxes receivable, current — 3,120 Accounts receivable & other miscellaneous assets 7,722 3,009 $ 27,013 $ 22,761

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2018
Short-term Debt [Abstract]
Schedule of Short-term Debt [Table Text Block]	Short-term borrowings were as follows as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Weighted Average Cost Balance Weighted Average Cost Balance Federal funds purchased 2.10 % $ 52,421 1.77 % $ 1,000 Securities sold under agreements to repurchase 0.91 75,046 0.71 96,229 Total 1.40 % $ 127,467 0.73 % $ 97,229

Junior Subordinated Notes Iss34

Junior Subordinated Notes Issued to Capital Trusts (Tables)	6 Months Ended
	Jun. 30, 2018
Junior Subordinated Notes [Abstract]
Schedule of Subordinated Borrowing [Table Text Block]	The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of June 30, 2018 and December 31, 2017 : Face Value Book Value Interest Rate Interest Rate at Maturity Date Callable Date (in thousands) 6/30/2018 June 30, 2018 Central Bancshares Capital Trust II (1) (2) $ 7,217 $ 6,702 Three-month LIBOR + 3.50% 5.84 % 03/15/2038 03/15/2013 Barron Investment Capital Trust I (1) (2) 2,062 1,675 Three-month LIBOR + 2.15% 4.49 % 09/23/2036 09/23/2011 MidWestOne Statutory Trust II (1) 15,464 15,464 Three-month LIBOR + 1.59% 3.93 % 12/15/2037 12/15/2012 Total $ 24,743 $ 23,841 Face Value Book Value Interest Rate Interest Rate at Maturity Date Callable Date (in thousands) 12/31/2017 December 31, 2017 Central Bancshares Capital Trust II (1) (2) $ 7,217 $ 6,674 Three-month LIBOR + 3.50% 5.09 % 03/15/2038 03/15/2013 Barron Investment Capital Trust I (1) (2) 2,062 1,655 Three-month LIBOR + 2.15% 3.82 % 09/23/2036 09/23/2011 MidWestOne Statutory Trust II (1) 15,464 15,464 Three-month LIBOR + 1.59% 3.18 % 12/15/2037 12/15/2012 Total $ 24,743 $ 23,793 (1) All distributions are cumulative and paid in cash quarterly.

Federal Home Loan Bank Borrow35

Federal Home Loan Bank Borrowings and Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Long-term Debt, by Type, Current and Noncurrent [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	ong-term debt were as follows as of June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Weighted Average Cost Balance Weighted Average Cost Balance FHLB Borrowings 2.12 % $ 143,000 1.72 % $ 115,000 Note payable to unaffiliated bank 3.75 10,000 3.32 12,500 Total 2.23 % $ 153,000 1.88 % $ 127,500

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	ncome tax expense for the three and six months ended June 30, 2018 and 2017 was less than the amount computed by applying the maximum effective federal income tax rate of 21% and 35% , respectively, to the income before income taxes, because of the following items: For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 (in thousands) Amount % of Pretax Income Amount % of Pretax Income Amount % of Pretax Income Amount % of Pretax Income Income tax based on statutory rate $ 2,160 21.0 % $ 3,629 35.0 % $ 4,213 21.0 % $ 6,864 35.0 % Tax-exempt interest (501 ) (4.9 ) (795 ) (7.7 ) (991 ) (4.9 ) (1,581 ) (8.1 ) Bank-owned life insurance (82 ) (0.8 ) (110 ) (1.1 ) (173 ) (0.9 ) (225 ) (1.1 ) State income taxes, net of federal income tax benefit 566 5.5 443 4.3 1,095 5.4 848 4.3 General business credits 7 (1.0 ) (19 ) (0.2 ) (40 ) (0.7 ) (40 ) (0.2 ) Other (19 ) 0.9 (12 ) (0.1 ) 11 0.6 (201 ) (1.0 ) Total income tax expense $ 2,131 20.7 % $ 3,136 30.2 % $ 4,115 20.5 % $ 5,665 28.9 %

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]	The following table presents the computation of earnings per common share for the respective periods: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands, except per share amounts) 2018 2017 2018 2017 Basic earnings per common share computation Numerator: Net income $ 8,156 $ 7,234 $ 15,949 $ 13,947 Denominator: Weighted average shares outstanding 12,218,240 12,200,689 12,220,453 11,855,108 Basic earnings per common share $ 0.67 $ 0.59 $ 1.31 $ 1.18 Diluted earnings per common share computation Numerator: Net income $ 8,156 $ 7,234 $ 15,949 $ 13,947 Denominator: Weighted average shares outstanding, including all dilutive potential shares 12,229,940 12,219,238 12,235,405 11,878,315 Diluted earnings per common share $ 0.67 $ 0.59 $ 1.30 $ 1.17

Estimated Fair Value of Finan38

Estimated Fair Value of Financial Instruments and Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table summarizes assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 . The assets and liabilities are segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value: Fair Value Measurement at June 30, 2018 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Available for sale debt securities: U.S. Government agencies and corporations $ 5,543 $ — $ 5,543 $ — State and political subdivisions 141,715 — 141,715 — Mortgage-backed securities 54,370 — 54,370 — Collateralized mortgage obligations 172,010 — 172,010 — Corporate debt securities 64,674 — 64,674 — Total available for sale debt securities $ 438,312 $ — $ 438,312 $ — Derivatives $ 113 $ — $ 113 $ — Liabilities: Derivatives $ 158 $ — $ 158 $ — Fair Value Measurement at December 31, 2017 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Available for sale debt securities: U.S. Government agencies and corporations $ 15,626 $ — $ 15,626 $ — State and political subdivisions 141,839 — 141,839 — Mortgage-backed securities 48,497 — 48,497 — Collateralized mortgage obligations 168,196 — 168,196 — Corporate debt securities 71,166 — 71,166 — Total available for sale debt securities $ 445,324 $ — $ 445,324 $ —
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]	The following table discloses the Company’s estimated fair value amounts of its assets recorded at fair value on a nonrecurring basis. It is management’s belief that the fair values presented below are reasonable based on the valuation techniques and data available to the Company as of June 30, 2018 and December 31, 2017 , as more fully described above. Fair Value Measurement at June 30, 2018 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Collateral dependent impaired loans $ 6,169 $ — $ — $ 6,169 Other real estate owned $ 676 $ — $ — $ 676 Fair Value Measurement at December 31, 2017 Using (in thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Collateral dependent impaired loans $ 3,927 $ — $ — $ 3,927 Other real estate owned $ 2,010 $ — $ — $ 2,010
Fair Value, by Balance Sheet Grouping [Table Text Block]	Due to the adoption of ASU 2016-01 as of January 1, 2018, the estimated fair value amounts shown for December 31, 2017 are not comparable to those for June 30, 2018 , due to a change in the required methodology (“exit price” only) for determining current estimated fair value. The carrying amount and estimated fair value of financial instruments not carried at fair value, at June 30, 2018 and December 31, 2017 are as follows: June 30, 2018 (in thousands) Carrying Amount Estimated Fair Value Quoted Significant Other Significant Financial assets: Cash and cash equivalents $ 43,264 $ 43,264 $ 43,264 $ — $ — Investment securities: Equity securities 2,809 2,809 2,809 — — Debt securities available for sale 438,312 438,312 — 438,312 — Debt securities held to maturity 192,896 188,407 — 188,407 — Total investment securities 634,017 629,528 2,809 626,719 — Loans held for sale 1,528 1,548 — 1,548 — Loans held for investment, net 2,333,235 2,268,777 — — 2,268,777 Interest receivable 13,636 13,636 13,636 — — Federal Home Loan Bank stock 14,748 14,748 — 14,748 — Derivative assets 113 113 — 113 — Financial liabilities: Deposits: Non-interest bearing demand 469,862 469,862 469,862 — — Interest-bearing checking 1,183,384 1,183,384 1,183,384 — — Savings 216,866 216,866 216,866 — — Certificates of deposit under $100,000 341,584 336,859 — 336,859 — Certificates of deposit $100,000 and over 392,505 388,913 — 388,913 — Total deposits 2,604,201 2,595,884 1,870,112 725,772 — Federal funds purchased and securities sold under agreements to repurchase 127,467 127,467 127,467 — — Federal Home Loan Bank borrowings 143,000 141,069 — 141,069 — Junior subordinated notes issued to capital trusts 23,841 21,032 — 21,032 — Long-term debt 10,000 10,000 — 10,000 — Derivative liabilities 158 158 — 158 — December 31, 2017 (in thousands) Carrying Amount Estimated Fair Value Quoted Prices in Markets for Significant Other Significant Financial assets: Cash and cash equivalents $ 50,972 $ 50,972 $ 50,972 $ — $ — Investment securities: Equity securities 2,336 2,336 2,336 — — Debt securities available for sale 445,324 445,324 — 445,324 — Debt securities held to maturity 195,619 194,343 — 194,343 — Total investment securities 643,279 642,003 2,336 639,667 — Loans held for sale 856 871 — — 871 Loans held for investment, net 2,258,636 2,256,726 — 2,256,726 — Interest receivable 14,732 14,732 14,732 — — Federal Home Loan Bank stock 11,324 11,324 — 11,324 — Financial liabilities: Deposits: Non-interest bearing demand 461,969 461,969 461,969 — — Interest-bearing checking 1,228,112 1,228,112 1,228,112 — — Savings 213,430 213,430 213,430 — — Certificates of deposit under $100,000 324,681 321,197 — 321,197 — Certificates of deposit $100,000 and over 377,127 374,685 — 374,685 — Total deposits 2,605,319 2,599,393 1,903,511 695,882 — Federal funds purchased and securities sold under agreements to repurchase 97,229 97,229 97,229 — — Federal Home Loan Bank borrowings 115,000 114,945 — 114,945 — Junior subordinated notes issued to capital trusts 23,793 19,702 — 19,702 — Long-term debt 12,500 12,500 — 12,500 —
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Table Text Block]	The following presents the valuation technique(s), unobservable inputs, and quantitative information about the unobservable inputs used for fair value measurements of the financial instruments held by the Company at June 30, 2018 , categorized within Level 3 of the fair value hierarchy: Quantitative Information About Level 3 Fair Value Measurements (dollars in thousands) Fair Value at June 30, 2018 Valuation Techniques(s) Unobservable Input Range of Inputs Weighted Average Collateral dependent impaired loans $ 6,169 Modified appraised value Third party appraisal NM * - NM * NM * Appraisal discount NM * - NM * NM * Other real estate owned $ 676 Modified appraised value Third party appraisal NM * - NM * NM * Appraisal discount NM * - NM * NM *

Investment Securities Schedule

Investment Securities Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities
Amortized cost basis	$ 448,335	$ 448,922
Gross unrealized gains	1,473	2,716
Gross unrealized losses	11,496	6,314
Estimated fair value	438,312	445,324
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities
Amortized cost basis	5,594	15,716
Gross unrealized gains	0	0
Gross unrealized losses	51	90
Estimated fair value	5,543	15,626
State and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost basis	140,935	139,561
Gross unrealized gains	1,321	2,475
Gross unrealized losses	541	197
Estimated fair value	141,715	141,839
Mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost basis	55,864	48,744
Gross unrealized gains	128	181
Gross unrealized losses	1,622	428
Estimated fair value	54,370	48,497
Collateralized mortgage obligations
Schedule of Available-for-sale Securities
Amortized cost basis	179,862	173,339
Gross unrealized gains	7	29
Gross unrealized losses	7,859	5,172
Estimated fair value	172,010	168,196
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized cost basis	66,080	71,562
Gross unrealized gains	17	31
Gross unrealized losses	1,423	427
Estimated fair value	$ 64,674	$ 71,166

Investment Securities Schedul40

Investment Securities Schedule of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities
Held to maturity securities, amortized cost	$ 192,896	$ 195,619
Gross unrealized gains	555	1,356
Gross unrealized losses	5,044	2,632
Estimated fair value	188,407	194,343
U.S. Government agencies and corporations
Schedule of Held-to-maturity Securities
Held to maturity securities, amortized cost		10,049
Estimated fair value		10,049
State and political subdivisions
Schedule of Held-to-maturity Securities
Held to maturity securities, amortized cost	125,948	126,413
Gross unrealized gains	289	804
Gross unrealized losses	3,063	1,631
Estimated fair value	123,174	125,586
Mortgage-backed securities
Schedule of Held-to-maturity Securities
Held to maturity securities, amortized cost	11,586	1,906
Gross unrealized gains	2	4
Gross unrealized losses	472	13
Estimated fair value	11,116	1,897
Collateralized mortgage obligations
Schedule of Held-to-maturity Securities
Held to maturity securities, amortized cost	20,243	22,115
Gross unrealized losses	1,020	707
Estimated fair value	19,223	21,408
Corporate debt securities
Schedule of Held-to-maturity Securities
Held to maturity securities, amortized cost	35,119	35,136
Gross unrealized gains	264	548
Gross unrealized losses	489	281
Estimated fair value	$ 34,894	$ 35,403

Investment Securities Available

Investment Securities Available for Sale Securities in Continuous Loss Position (Details) $ in Thousands	Jun. 30, 2018USD ($)count	Dec. 31, 2017USD ($)count
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count	157	105
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 195,944	$ 158,516
Available for sale securities, continuous unrealized loss position, less than 12 months, Accumulated Loss	4,110	1,403
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	137,647	139,240
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	7,386	4,967
Available for sale securities, continuous unrealized loss position, fair value	333,591	297,756
Available for sale securities, continuous unrealized loss position, accumulated loss	$ 11,496	$ 6,370
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count	2	3
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 5,543	$ 15,626
Available for sale securities, continuous unrealized loss position, less than 12 months, Accumulated Loss	51	90
Available for sale securities, continuous unrealized loss position, fair value	5,543	15,626
Available for sale securities, continuous unrealized loss position, accumulated loss	$ 51	$ 90
State and political subdivisions
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count	73	34
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 35,538	$ 11,705
Available for sale securities, continuous unrealized loss position, less than 12 months, Accumulated Loss	471	167
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	2,757	1,800
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	70	30
Available for sale securities, continuous unrealized loss position, fair value	38,295	13,505
Available for sale securities, continuous unrealized loss position, accumulated loss	$ 541	$ 197
Mortgage-backed securities
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count	27	20
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 53,518	$ 37,964
Available for sale securities, continuous unrealized loss position, less than 12 months, Accumulated Loss	1,447	359
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	6,176	3,961
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	175	69
Available for sale securities, continuous unrealized loss position, fair value	59,694	41,925
Available for sale securities, continuous unrealized loss position, accumulated loss	$ 1,622	$ 428
Collateralized mortgage obligations
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count	43	35
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 46,904	$ 37,881
Available for sale securities, continuous unrealized loss position, less than 12 months, Accumulated Loss	958	489
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	120,274	122,757
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	6,901	4,683
Available for sale securities, continuous unrealized loss position, fair value	167,178	160,638
Available for sale securities, continuous unrealized loss position, accumulated loss	$ 7,859	$ 5,172
Corporate debt securities
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count	12	12
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 54,441	$ 55,340
Available for sale securities, continuous unrealized loss position, less than 12 months, Accumulated Loss	1,183	298
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	8,440	8,778
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	240	129
Available for sale securities, continuous unrealized loss position, fair value	62,881	64,118
Available for sale securities, continuous unrealized loss position, accumulated loss	$ 1,423	$ 427
Equity securities
Schedule of Available-for-sale Securities
Available for sale securities in unrealized loss positions, number of positions | count		1
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value		$ 1,944
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss		56
Available for sale securities, continuous unrealized loss position, fair value		1,944
Available for sale securities, continuous unrealized loss position, accumulated loss		$ 56

Investment Securities Held to M

Investment Securities Held to Maturity Securities in Continuous Loss Position (Details) $ in Thousands	Jun. 30, 2018USD ($)count	Dec. 31, 2017USD ($)count
Schedule of Held-to-maturity Securities
Held to maturity securities in unrealized loss positions, number of positions | count	244	181
Held to maturity securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 76,993	$ 41,900
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	2,078	489
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	45,775	45,515
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	2,966	2,143
Held to maturity securities, continuous urealized loss position, fair value	122,768	87,415
Held to maturity securities, continuous unrealized loss position, accumulated loss	$ 5,044	$ 2,632
State and political subdivisions
Schedule of Held-to-maturity Securities
Held to maturity securities in unrealized loss positions, number of positions | count	224	167
Held to maturity securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 49,218	$ 33,237
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	1,135	393
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	27,690	25,843
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	1,928	1,238
Held to maturity securities, continuous urealized loss position, fair value	76,908	59,080
Held to maturity securities, continuous unrealized loss position, accumulated loss	$ 3,063	$ 1,631
Mortgage-backed securities
Schedule of Held-to-maturity Securities
Held to maturity securities in unrealized loss positions, number of positions | count	6	4
Held to maturity securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 10,203	$ 349
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	438	2
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	841	887
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	34	11
Held to maturity securities, continuous urealized loss position, fair value	11,044	1,236
Held to maturity securities, continuous unrealized loss position, accumulated loss	$ 472	$ 13
Collateralized mortgage obligations
Schedule of Held-to-maturity Securities
Held to maturity securities in unrealized loss positions, number of positions | count	7	7
Held to maturity securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 4,690	$ 5,221
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	187	90
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	14,520	16,168
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	833	617
Held to maturity securities, continuous urealized loss position, fair value	19,210	21,389
Held to maturity securities, continuous unrealized loss position, accumulated loss	$ 1,020	$ 707
Corporate debt securities
Schedule of Held-to-maturity Securities
Held to maturity securities in unrealized loss positions, number of positions | count	7	3
Held to maturity securities, continuous unrealized loss position, less than twelve months, estimated fair value	$ 12,882	$ 3,093
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	318	4
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	2,724	2,617
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	171	277
Held to maturity securities, continuous urealized loss position, fair value	15,606	5,710
Held to maturity securities, continuous unrealized loss position, accumulated loss	$ 489	$ 281

Investment Securities Investmen

Investment Securities Investments Classified by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]
Due in one year or less, amortized cost	$ 39,542
Due after one year through five years, amortized cost	107,415
Due after five years through ten years, amortized cost	62,298
Due after ten years, amortized cost	3,354
Debt securities without a single maturity date, amortized cost	235,726
Total available for sale securities, debt securities, amortized cost	448,335
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Due in one year or less, estimated fair value	39,518
Due after one year through five years, estimated fair value	106,371
Due after five years through ten years, estimated fair value	62,685
Due after ten years, estimated fair value	3,358
Debt securities without a single maturity date, estimated fair value	226,380
Total debt securities available for sale, estimated fair value	438,312	$ 445,324
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]
Due in one year or less, amortized cost	520
Due after one year through five years, amortized cost	23,357
Due after five years through ten years, amortized cost	94,804
Due after ten years, amortized cost	42,386
Debt securities without a single maturity date, amortized cost	31,829
Held to maturity securities, amortized cost	192,896	195,619
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Due in one year or less, estimated fair value	521
Due after one year through five years, estimated fair value	23,016
Due after five years through ten years, estimated fair value	93,529
Due after ten years, estimated fair value	41,002
Debt securities without a single maturity date, estimated fair value	30,339
Fair value of debt securities held to maturity	$ 188,407	$ 194,343

Investment Securities Realized

Investment Securities Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Marketable Securities, Equity Securities [Abstract]
Equity Securities, FV-NI, Realized Gain (Loss)	$ (7)		$ (23)
Gain (Loss) on Sale of Equity Investments	0		0
Equity Securities, FV-NI, Unrealized Gain (Loss)	(7)		(23)
Debt securities
Available-for-sale Securities [Abstract]
Gross realized gains	0	$ 20	9	$ 20
Available for sale securities, gross realized gain (loss)		20	9	20
Held-to-maturity Securities [Abstract]
Gross realized gains	0	0	0	43
Gross realized losses	(4)	0	(4)	0
Held to maturity securities, gross realized gain (loss)	$ (4)	$ 0	$ (4)	$ 43

Investment Securities Textual R

Investment Securities Textual References (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Available-for-sale Securities
Available-for-sale securities pledged as collateral		$ 235,200		$ 237,400
Equity securities		2,809		$ 2,336
Proceeds from sales of debt securities held to maturity	$ 1,200	0	$ 1,153
Other equity securities | Banks and Financial Service-Related Companies
Schedule of Available-for-sale Securities
Equity securities		400
Community Reinvestment Act qualified investment
Schedule of Available-for-sale Securities
Equity securities		$ 2,400
Geographic Concentration Risk | Total Obligations of State and Political Subdivisions | State and political subdivisions | IOWA
Schedule of Available-for-sale Securities
Concentration risk, percentage		55.00%
Geographic Concentration Risk | Total Obligations of State and Political Subdivisions | State and political subdivisions | MINNESOTA
Schedule of Available-for-sale Securities
Concentration risk, percentage		22.00%

Loans Receivable and the Allo46

Loans Receivable and the Allowance for Loan Losses Allowance for Loan Losses and Recorded Investment in Loan Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, allowance for credit losses, individually evaluated for impairment	$ 7,493		$ 3,649
Loans receivable, allowance for credit losses, collectively evaluated for impairment	22,495		23,612
Certain loans acquired in transfer not accounted for as debt securities, allowance for loan losses			798
Allowance for loan losses	30,800	$ 29,671	28,059	$ 22,510	$ 22,217	$ 21,850
Financing Receivable [Abstract]
Loans receivable, individually evaluated for impairment	45,154		26,811
Loans receivable, collectively evaluated for impairment	2,300,703		2,240,153
Loans receivable,purchased credit impaired			19,731
Loans and leases receivable, gross	2,364,035		2,286,695
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain loans acquired in transfer not accounted for as debt securities, allowance for loan losses	812
Financing Receivable [Abstract]
Loans receivable,purchased credit impaired	18,178
Agricultural Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, allowance for credit losses, individually evaluated for impairment	287		140
Loans receivable, allowance for credit losses, collectively evaluated for impairment	2,369		2,650
Allowance for loan losses	2,656	3,153	2,790	2,666	2,460	2,003
Financing Receivable [Abstract]
Loans receivable, individually evaluated for impairment	8,056		2,969
Loans receivable, collectively evaluated for impairment	95,373		102,543
Loans and leases receivable, gross	103,429		105,512
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, allowance for credit losses, individually evaluated for impairment	3,093		1,126
Loans receivable, allowance for credit losses, collectively evaluated for impairment	5,464		7,392
Allowance for loan losses	8,557	8,362	8,518	7,959	6,021	6,274
Financing Receivable [Abstract]
Loans receivable, individually evaluated for impairment	12,865		9,734
Loans receivable, collectively evaluated for impairment	499,438		493,844
Loans and leases receivable, gross	512,357		503,624
Commercial Portfolio Segment | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable [Abstract]
Loans receivable,purchased credit impaired	54		46
Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, allowance for credit losses, individually evaluated for impairment	3,950		2,157
Loans receivable, allowance for credit losses, collectively evaluated for impairment	12,053		11,144
Allowance for loan losses	16,341	14,997	13,637	9,013	9,751	9,860
Financing Receivable [Abstract]
Loans receivable, individually evaluated for impairment	20,477		10,386
Loans receivable, collectively evaluated for impairment	1,209,911		1,147,133
Loans and leases receivable, gross	1,243,894		1,171,971
Commercial Real Estate Portfolio Segment | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain loans acquired in transfer not accounted for as debt securities, allowance for loan losses	338		336
Financing Receivable [Abstract]
Loans receivable,purchased credit impaired	13,506		14,452
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, allowance for credit losses, individually evaluated for impairment	163		226
Loans receivable, allowance for credit losses, collectively evaluated for impairment	2,353		2,182
Allowance for loan losses	2,990	2,877	2,870	2,650	3,764	3,458
Financing Receivable [Abstract]
Loans receivable, individually evaluated for impairment	3,756		3,722
Loans receivable, collectively evaluated for impairment	459,045		460,475
Loans and leases receivable, gross	467,419		469,430
Residential Portfolio Segment | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain loans acquired in transfer not accounted for as debt securities, allowance for loan losses	474		462
Financing Receivable [Abstract]
Loans receivable,purchased credit impaired	4,618		5,233
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, allowance for credit losses, collectively evaluated for impairment	256		244
Allowance for loan losses	256	$ 282	244	$ 222	$ 221	$ 255
Financing Receivable [Abstract]
Loans receivable, collectively evaluated for impairment	36,936		36,158
Loans and leases receivable, gross	$ 36,936		$ 36,158

Loans Receivable and the Allo47

Loans Receivable and the Allowance for Loan Losses Allowance for Loan Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 29,671	$ 22,217	$ 28,059	$ 21,850
Charge-offs	(291)	(1,043)	(767)	(1,759)
Recoveries	170	96	408	138
Provision	1,250	1,240	3,100	2,281
Ending balance	30,800	22,510	30,800	22,510
Agricultural Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,153	2,460	2,790	2,003
Charge-offs	(268)	(347)	(268)	(884)
Recoveries	9	4	15	14
Provision	(238)	549	119	1,533
Ending balance	2,656	2,666	2,656	2,666
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	8,362	6,021	8,518	6,274
Charge-offs	(3)	(464)	(90)	(529)
Recoveries	103	83	182	102
Provision	95	2,319	(53)	2,112
Ending balance	8,557	7,959	8,557	7,959
Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	14,997	9,751	13,637	9,860
Charge-offs		(45)	(264)	(106)
Recoveries	40	5	116	15
Provision	1,304	(698)	2,852	(756)
Ending balance	16,341	9,013	16,341	9,013
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,877	3,764	2,870	3,458
Charge-offs	(3)	(52)	(107)	(80)
Recoveries	15		77
Provision	101	(1,062)	150	(728)
Ending balance	2,990	2,650	2,990	2,650
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	282	221	244	255
Charge-offs	(17)	(135)	(38)	(160)
Recoveries	3	4	18	7
Provision	(12)	132	32	120
Ending balance	$ 256	$ 222	$ 256	$ 222

Loans Receivable and the Allo48

Loans Receivable and the Allowance for Loan Losses New Troubled Debt Restructurings During Period (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018USD ($)count	Jun. 30, 2017USD ($)count	Jun. 30, 2018USD ($)count	Jun. 30, 2017USD ($)count
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts | count		1	3	1	10
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 86	$ 10,722	$ 86	$ 13,727
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 86	$ 11,099	$ 86	$ 14,150
Commercial and Industrial Loan Financing Receivable | Extended Maturity
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts | count	[1]				6
Financing Receivable, Modifications, Pre-Modification Recorded Investment	[1]				$ 2,037
Financing Receivable, Modifications, Post-Modification Recorded Investment	[1]				$ 2,083
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable | Extended Maturity
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts | count	[1]	1	2	1	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment	[1]	$ 86	$ 176	$ 86	$ 176
Financing Receivable, Modifications, Post-Modification Recorded Investment	[1]	$ 86	$ 176	$ 86	$ 176
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable | Extended Maturity
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts | count	[1]				1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	[1]				$ 968
Financing Receivable, Modifications, Post-Modification Recorded Investment	[1]				$ 968
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable | Other Concession
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts | count	[1]		1		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	[1]		$ 10,546		$ 10,546
Financing Receivable, Modifications, Post-Modification Recorded Investment	[1]		$ 10,923		$ 10,923
[1]	TDRs may include multiple concessions, and the disclosure classifications are based on the primary concession provided to the borrower.

Loans Receivable and the Allo49

Loans Receivable and the Allowance for Loan Losses New Troubled Debt Restructurings During Past Twelve Months That Defaulted During the Period (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018USD ($)count	Jun. 30, 2017USD ($)count	Jun. 30, 2018USD ($)count	Jun. 30, 2017USD ($)count
Financing Receivable, Modifications
Financing receivable, modifications, subsequent default, number of contracts | count		0	2	1	5
Financing receivable, modifications, subsequent default, recorded investment | $		$ 0	$ 1,518	$ 2,657	$ 2,472
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable | Extended Maturity
Financing Receivable, Modifications
Financing receivable, modifications, subsequent default, number of contracts | count	[1]		1		4
Financing receivable, modifications, subsequent default, recorded investment | $	[1]		$ 550		$ 1,504
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable | Extended Maturity
Financing Receivable, Modifications
Financing receivable, modifications, subsequent default, number of contracts | count	[1]		1	1	1
Financing receivable, modifications, subsequent default, recorded investment | $	[1]		$ 968	$ 2,657	$ 968
[1]	TDRs may include multiple concessions, and the disclosure classifications are based on the primary concession provided to the borrower.

Loans Receivable and the Allo50

Loans Receivable and the Allowance for Loan Losses Loans by Internally Assigned Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment
Loans receivable, net	$ 2,364,035	$ 2,286,695
Purchased credit-impaired loans, internally classified as other than pass	11,400	12,600
Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	2,199,301	2,127,454
Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	99,220	96,842
Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	65,481	62,362
Internally Assigned Grade Doubtful
Financing Receivable, Recorded Investment
Loans receivable, net	33	37
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	103,429	105,512
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	76,987	80,377
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	17,723	21,989
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	8,719	3,146
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	512,357	503,624
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	473,717	453,363
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	21,118	23,153
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	17,517	27,102
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable | Internally Assigned Grade Doubtful
Financing Receivable, Recorded Investment
Loans receivable, net	5	6
Commercial Real Estate Portfolio Segment
Financing Receivable, Recorded Investment
Loans receivable, net	1,243,894	1,171,971
Commercial Real Estate Portfolio Segment | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	1,156,055	1,102,446
Commercial Real Estate Portfolio Segment | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	56,436	47,972
Commercial Real Estate Portfolio Segment | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	31,403	21,553
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	206,269	165,276
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	203,880	162,968
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	1,216	1,061
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	1,173	1,247
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	88,761	87,868
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	70,237	76,740
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	8,514	10,357
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	10,010	771
Commercial Real Estate Portfolio Segment | Multifamily Real Estate Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	129,659	134,506
Commercial Real Estate Portfolio Segment | Multifamily Real Estate Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	127,072	131,507
Commercial Real Estate Portfolio Segment | Multifamily Real Estate Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	1,406	2,498
Commercial Real Estate Portfolio Segment | Multifamily Real Estate Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	1,181	501
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	819,205	784,321
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	754,866	731,231
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	45,300	34,056
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	19,039	19,034
Residential Portfolio Segment
Financing Receivable, Recorded Investment
Loans receivable, net	467,419	469,430
Residential Portfolio Segment | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	455,770	455,209
Residential Portfolio Segment | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	3,810	3,728
Residential Portfolio Segment | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	7,839	10,493
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	350,281	352,226
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	340,610	340,446
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	3,104	2,776
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	6,567	9,004
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	117,138	117,204
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	115,160	114,763
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	706	952
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	1,272	1,489
Consumer Portfolio Segment | Consumer Loan Financing Receivable
Financing Receivable, Recorded Investment
Loans receivable, net	36,936	36,158
Consumer Portfolio Segment | Consumer Loan Financing Receivable | Internally Assigned Grade Pass
Financing Receivable, Recorded Investment
Loans receivable, net	36,772	36,059
Consumer Portfolio Segment | Consumer Loan Financing Receivable | Internally Assigned Grade Special Mention Watch
Financing Receivable, Recorded Investment
Loans receivable, net	133
Consumer Portfolio Segment | Consumer Loan Financing Receivable | Internally Assigned Grade Substandard
Financing Receivable, Recorded Investment
Loans receivable, net	3	68
Consumer Portfolio Segment | Consumer Loan Financing Receivable | Internally Assigned Grade Doubtful
Financing Receivable, Recorded Investment
Loans receivable, net	$ 28	$ 31

Loans Receivable and the Allo51

Loans Receivable and the Allowance for Loan Losses Amounts and Categories of Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	$ 27,300		$ 27,300		$ 17,703
Impaired financing receivable, with no related allowance, unpaid principal balance	28,727		28,727		19,116
Impaired financing receivable, with related allowance, recorded investment	17,854		17,854		9,108
Impaired financing receivable, with related allowance, unpaid principal balance	25,633		25,633		16,406
Impaired financing receivable, related allowance	7,493		7,493		3,649
Impaired financing receivable, recorded investment	45,154		45,154		26,811
Impaired financing receivable, unpaid principal balance	54,360		54,360		35,522
Impaired financing receivable, with no related allowance, average recorded investment	24,570	$ 13,565	19,454	$ 13,262
Impaired financing receivable, with no related allowance, interest income, accrual method	749	286	959	411
Impaired financing receivable, with related allowance, average recorded investment	16,855	14,774	16,030	12,001
Impaired financing receivable, with related allowance, interest income, accrual method	154	100	189	130
Impaired financing receivable, average recorded investment	41,425	28,339	35,484	25,263
Impaired financing receivable, interest income, accrual method	903	386	1,148	541
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	6,307		6,307		1,523
Impaired financing receivable, with no related allowance, unpaid principal balance	6,807		6,807		2,023
Impaired financing receivable, with related allowance, recorded investment	1,749		1,749		1,446
Impaired financing receivable, with related allowance, unpaid principal balance	1,754		1,754		1,446
Impaired financing receivable, related allowance	287		287		140
Impaired financing receivable, recorded investment	8,056		8,056		2,969
Impaired financing receivable, unpaid principal balance	8,561		8,561		3,469
Impaired financing receivable, with no related allowance, average recorded investment	6,037	1,192	4,422	1,216
Impaired financing receivable, with no related allowance, interest income, accrual method	296	66	363	79
Impaired financing receivable, with related allowance, average recorded investment	1,622	1,855	1,610	1,875
Impaired financing receivable, with related allowance, interest income, accrual method	57	53	71	67
Impaired financing receivable, average recorded investment	7,659	3,047	6,032	3,091
Impaired financing receivable, interest income, accrual method	353	119	434	146
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	4,162		4,162		7,588
Impaired financing receivable, with no related allowance, unpaid principal balance	4,528		4,528		7,963
Impaired financing receivable, with related allowance, recorded investment	8,703		8,703		2,146
Impaired financing receivable, with related allowance, unpaid principal balance	8,810		8,810		2,177
Impaired financing receivable, related allowance	3,093		3,093		1,126
Impaired financing receivable, recorded investment	12,865		12,865		9,734
Impaired financing receivable, unpaid principal balance	13,338		13,338		10,140
Impaired financing receivable, with no related allowance, average recorded investment	3,954	4,787	3,465	4,143
Impaired financing receivable, with no related allowance, interest income, accrual method	98	67	144	90
Impaired financing receivable, with related allowance, average recorded investment	7,797	4,444	7,457	3,495
Impaired financing receivable, with related allowance, interest income, accrual method	53	14	37	37
Impaired financing receivable, average recorded investment	11,751	9,231	10,922	7,638
Impaired financing receivable, interest income, accrual method	151	81	181	127
Commercial Real Estate Portfolio Segment
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	14,041		14,041		6,117
Impaired financing receivable, with no related allowance, unpaid principal balance	14,550		14,550		6,622
Impaired financing receivable, with related allowance, recorded investment	6,436		6,436		4,269
Impaired financing receivable, with related allowance, unpaid principal balance	14,103		14,103		11,536
Impaired financing receivable, related allowance	3,950		3,950		2,157
Impaired financing receivable, recorded investment	20,477		20,477		10,386
Impaired financing receivable, unpaid principal balance	28,653		28,653		18,158
Impaired financing receivable, with no related allowance, average recorded investment	11,844	5,164	9,522	5,473
Impaired financing receivable, with no related allowance, interest income, accrual method	335	107	441	172
Impaired financing receivable, with related allowance, average recorded investment	6,467	7,103	5,991	5,242
Impaired financing receivable, with related allowance, interest income, accrual method	26	16	54
Impaired financing receivable, average recorded investment	18,311	12,267	15,513	10,715
Impaired financing receivable, interest income, accrual method	361	123	495	172
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	84		84		84
Impaired financing receivable, with no related allowance, unpaid principal balance	84		84		84
Impaired financing receivable, recorded investment	84		84		84
Impaired financing receivable, unpaid principal balance	84		84		84
Impaired financing receivable, with no related allowance, average recorded investment	84	360	84	360
Impaired financing receivable, with related allowance, average recorded investment		809		832
Impaired financing receivable, average recorded investment	84	1,169	84	1,192
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	6,532		6,532		287
Impaired financing receivable, with no related allowance, unpaid principal balance	6,532		6,532		287
Impaired financing receivable, with related allowance, recorded investment	2,123		2,123
Impaired financing receivable, with related allowance, unpaid principal balance	2,123		2,123
Impaired financing receivable, related allowance	648		648
Impaired financing receivable, recorded investment	8,655		8,655		287
Impaired financing receivable, unpaid principal balance	8,655		8,655		287
Impaired financing receivable, with no related allowance, average recorded investment	5,242	1,686	3,494	2,073
Impaired financing receivable, with no related allowance, interest income, accrual method	185	36	234	69
Impaired financing receivable, with related allowance, average recorded investment	2,107		1,405
Impaired financing receivable, with related allowance, interest income, accrual method	26		54
Impaired financing receivable, average recorded investment	7,349	1,686	4,899	2,073
Impaired financing receivable, interest income, accrual method	211	36	288	69
Commercial Real Estate Portfolio Segment | Multifamily Real Estate Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	823		823
Impaired financing receivable, with no related allowance, unpaid principal balance	823		823
Impaired financing receivable, recorded investment	823		823
Impaired financing receivable, unpaid principal balance	823		823
Impaired financing receivable, with no related allowance, average recorded investment	825		550
Impaired financing receivable, with no related allowance, interest income, accrual method	20		30
Impaired financing receivable, average recorded investment	825		550
Impaired financing receivable, interest income, accrual method	20		30
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	6,602		6,602		5,746
Impaired financing receivable, with no related allowance, unpaid principal balance	7,111		7,111		6,251
Impaired financing receivable, with related allowance, recorded investment	4,313		4,313		4,269
Impaired financing receivable, with related allowance, unpaid principal balance	11,980		11,980		11,536
Impaired financing receivable, related allowance	3,302		3,302		2,157
Impaired financing receivable, recorded investment	10,915		10,915		10,015
Impaired financing receivable, unpaid principal balance	19,091		19,091		17,787
Impaired financing receivable, with no related allowance, average recorded investment	5,693	3,118	5,394	3,040
Impaired financing receivable, with no related allowance, interest income, accrual method	130	71	177	103
Impaired financing receivable, with related allowance, average recorded investment	4,360	6,294	4,586	4,410
Impaired financing receivable, with related allowance, interest income, accrual method		16
Impaired financing receivable, average recorded investment	10,053	9,412	9,980	7,450
Impaired financing receivable, interest income, accrual method	130	87	177	103
Residential Portfolio Segment
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	2,790		2,790		2,475
Impaired financing receivable, with no related allowance, unpaid principal balance	2,842		2,842		2,508
Impaired financing receivable, with related allowance, recorded investment	966		966		1,247
Impaired financing receivable, with related allowance, unpaid principal balance	966		966		1,247
Impaired financing receivable, related allowance	163		163		226
Impaired financing receivable, recorded investment	3,756		3,756		3,722
Impaired financing receivable, unpaid principal balance	3,808		3,808		3,755
Impaired financing receivable, with no related allowance, average recorded investment	2,735	2,422	2,045	2,430
Impaired financing receivable, with no related allowance, interest income, accrual method	20	46	11	70
Impaired financing receivable, with related allowance, average recorded investment	969	1,372	972	1,389
Impaired financing receivable, with related allowance, interest income, accrual method	18	17	27	26
Impaired financing receivable, average recorded investment	3,704	3,794	3,017	3,819
Impaired financing receivable, interest income, accrual method	38	63	38	96
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	2,488		2,488		2,449
Impaired financing receivable, with no related allowance, unpaid principal balance	2,540		2,540		2,482
Impaired financing receivable, with related allowance, recorded investment	966		966		979
Impaired financing receivable, with related allowance, unpaid principal balance	966		966		979
Impaired financing receivable, related allowance	163		163		185
Impaired financing receivable, recorded investment	3,454		3,454		3,428
Impaired financing receivable, unpaid principal balance	3,506		3,506		3,461
Impaired financing receivable, with no related allowance, average recorded investment	2,438	2,409	1,757	2,417
Impaired financing receivable, with no related allowance, interest income, accrual method	20	46	11	70
Impaired financing receivable, with related allowance, average recorded investment	969	1,372	972	1,389
Impaired financing receivable, with related allowance, interest income, accrual method	18	17	27	26
Impaired financing receivable, average recorded investment	3,407	3,781	2,729	3,806
Impaired financing receivable, interest income, accrual method	38	63	38	96
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Impaired
Impaired financing receivable, with no related allowance, recorded investment	302		302		26
Impaired financing receivable, with no related allowance, unpaid principal balance	302		302		26
Impaired financing receivable, with related allowance, recorded investment					268
Impaired financing receivable, with related allowance, unpaid principal balance					268
Impaired financing receivable, related allowance					41
Impaired financing receivable, recorded investment	302		302		294
Impaired financing receivable, unpaid principal balance	302		302		$ 294
Impaired financing receivable, with no related allowance, average recorded investment	297	13	288	13
Impaired financing receivable, average recorded investment	$ 297	$ 13	$ 288	$ 13

Loans Receivable and the Allo52

Loans Receivable and the Allowance for Loan Losses Past Due Loan Aging (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Loans past due	$ 16,944	$ 14,622
Loans current	2,347,091	2,272,073
Total Loans Receivable	2,364,035	2,286,695
Purchased Credit Impaired Loans Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	363	1,473
Loans current	17,815	18,258
Total Loans Receivable	18,178	19,731
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	3,950	6,135
Financing Receivables, 30 to 59 Days Past Due | Purchased Credit Impaired Loans Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	203	164
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,507	3,117
Financing Receivables, 60 to 89 Days Past Due | Purchased Credit Impaired Loans Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	160	756
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	11,487	5,370
Financing Receivables, Equal to Greater than 90 Days Past Due | Purchased Credit Impaired Loans Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due		553
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	783	381
Loans current	102,646	105,131
Total Loans Receivable	103,429	105,512
Agricultural Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Agricultural Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	503	95
Agricultural Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Agricultural Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due		118
Agricultural Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	280	168
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	7,335	4,346
Loans current	505,022	499,278
Total Loans Receivable	512,357	503,624
Commercial Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,144	1,434
Commercial Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	185	1,336
Commercial Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	6,006	1,576
Commercial Real Estate Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Loans past due	4,647	2,777
Loans current	1,239,247	1,169,194
Total Loans Receivable	1,243,894	1,171,971
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	94	236
Loans current	206,175	165,040
Total Loans Receivable	206,269	165,276
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	656	590
Loans current	88,105	87,278
Total Loans Receivable	88,761	87,868
Commercial Real Estate Portfolio Segment | Multifamily Real Estate Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due		25
Loans current	129,659	134,481
Total Loans Receivable	129,659	134,506
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	3,897	1,926
Loans current	815,308	782,395
Total Loans Receivable	819,205	784,321
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	715	348
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate Construction and Development Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	11	57
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Farmland Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	515	217
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	189	74
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	62	122
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate Construction and Development Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due		97
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Multifamily Real Estate Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due		25
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	62
Commercial Real Estate Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	3,870	2,307
Commercial Real Estate Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate Construction and Development Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	83	82
Commercial Real Estate Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Farmland Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	141	373
Commercial Real Estate Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	3,646	1,852
Residential Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Loans past due	4,081	6,995
Loans current	463,338	462,435
Total Loans Receivable	467,419	469,430
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	3,454	5,629
Loans current	346,827	346,597
Total Loans Receivable	350,281	352,226
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	627	1,366
Loans current	116,511	115,838
Total Loans Receivable	117,138	117,204
Residential Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,532	4,179
Residential Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,412	3,854
Residential Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	120	325
Residential Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,237	1,526
Residential Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,170	756
Residential Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	67	770
Residential Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans past due	1,312	1,290
Residential Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	872	1,019
Residential Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	440	271
Consumer Portfolio Segment | Consumer Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	98	123
Loans current	36,838	36,035
Total Loans Receivable	36,936	36,158
Consumer Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Consumer Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	56	79
Consumer Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Consumer Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	23	15
Consumer Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans past due	$ 19	$ 29

Loans Receivable and the Allo53

Loans Receivable and the Allowance for Loan Losses Nonaccrual and 90+ Days Past Due and Still Accruing Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	$ 13,067	$ 14,784
Loans 90 days past due and still accruing	151	207
Purchased Credit Impaired Loans Receivable
Financing Receivable, Recorded Investment, Past Due
Loans, nonaccrual or 90 days past due and still accruing	300	700
Loans, discount, nonaccrual or 90 days past due and still accruing	100	100
Agricultural Portfolio Segment | Agricultural Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	255	168
Loans 90 days past due and still accruing	52
Commercial Portfolio Segment | Commercial and Industrial Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	6,790	7,124
Commercial Real Estate Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	4,381	5,853
Loans 90 days past due and still accruing		0
Commercial Real Estate Portfolio Segment | Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	102	188
Commercial Real Estate Portfolio Segment | Farmland Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	278	386
Commercial Real Estate Portfolio Segment | Commercial Real Estate Loan Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	4,001	5,279
Residential Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	1,578	1,574
Loans 90 days past due and still accruing	99	207
Residential Portfolio Segment | Residential Real Estate First Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	1,085	1,228
Loans 90 days past due and still accruing	60	205
Residential Portfolio Segment | Residential Real Estate Junior Lien Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	493	346
Loans 90 days past due and still accruing	39	2
Consumer Portfolio Segment | Consumer Loan Financing Receivable
Financing Receivable, Recorded Investment, Past Due
Loans in nonaccrual status	$ 63	$ 65

Loans Receivable and the Allo54

Loans Receivable and the Allowance for Loan Losses Accretable Yield for Loans Acquired and Accounted for Under ASC 310-30 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Loans and Leases Receivable Disclosure [Abstract]
Balance at beginning of period	$ 608	$ 1,633	$ 840	$ 1,961
Accretion	(373)	(475)	(650)	(891)
Reclassifications from nonaccretable difference	76	213	121	301
Balance at end of period	$ 311	$ 1,371	$ 311	$ 1,371

Loans Receivable and the Allo55

Loans Receivable and the Allowance for Loan Losses Textual References (Details) $ in Millions	Jun. 30, 2018USD ($)quarters	Dec. 31, 2017USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans pledged for Federal Home Loan Bank debt	$ 476.8	$ 477.6
Allowance for loan losses, maximum overage percentage	20.00%
Allowance for loan losses, maximum shortage percentage	5.00%
Loans reviewed collectively for impairment, historical loss lookback, number of quarters | quarters	20
Loans and leases receivable, impaired, commitment to lend	$ 0.3
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit-impaired loans, outstanding balance	19.3
Purchased credit-impaired loans, discount	$ 1.1

Derivatives and Hedging Activ56

Derivatives and Hedging Activities Derivatives and Hedging Activities (Details) - Interest Rate Swap - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount	$ 5,605	$ 0
Designated as Hedging Instrument | Derivative Financial Instruments, Assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Designated as Hedging Instrument | Derivative Financial Instruments, Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	26	0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount	10,720	0
Not Designated as Hedging Instrument | Derivative Financial Instruments, Assets
Derivatives, Fair Value [Line Items]
Derivative assets	113	0
Not Designated as Hedging Instrument | Derivative Financial Instruments, Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 132	$ 0

Derivatives and Hedging Activ57

Derivatives and Hedging Activities Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location (Details) - Designated as Hedging Instrument - Interest Rate Swap - Fair Value Hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	$ 135	$ 0	$ 135	$ 0
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedge ineffectiveness, net	(1)	0	(1)	0
Derivative designated as hedging instruments	(136)	0	(136)	0
Other Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedge ineffectiveness, net	0	0	0	0
Hedged items	0	0	0
Derivative designated as hedging instruments	$ 0	$ 0	$ 0	$ 0

Derivatives and Hedging Activ58

Derivatives and Hedging Activities Hedged Items in Fair Value Hedging Relationship (Details) - Hedged Item, Loans - Interest Rate Swap - Designated as Hedging Instrument - Fair Value Hedging $ in Thousands	Jun. 30, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of hedged assets	$ 5,630
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged asset	$ 25

Derivatives and Hedging Activ59

Derivatives and Hedging Activities Textual References (Details)	Jun. 30, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of derivatives in a net liability position, including accrued interest	$ 163,000

Goodwill and Intangible Asset60

Goodwill and Intangible Assets Changes in Carrying Amount of Non-Goodwill Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2018
Schedule of Intangible Assets [Line Items]
Balance, beginning of period			$ 12,046
Finite-lived intangible assets acquired					$ 125
Amortization expense	$ (589)	$ (804)	(1,246)	$ (1,653)
Balance at end of period	10,925		10,925		12,046
Gross carrying amount						$ 28,401
Accumulated amortizations						(17,476)
Net book value	10,925		10,925		12,046	10,925
Trade names intangible
Schedule of Intangible Assets [Line Items]
Balance, beginning of period			7,040
Amortization expense			0
Balance at end of period	7,040		7,040		7,040
Gross carrying amount						7,040
Net book value	7,040		7,040		7,040	7,040
Insurance agency intangible
Schedule of Intangible Assets [Line Items]
Balance, beginning of period			148
Finite-lived intangible assets acquired					0
Amortization expense			(19)
Balance at end of period	129		129		148
Gross carrying amount						1,320
Accumulated amortizations						(1,191)
Net book value	129		148		148	129
Core deposit intangible
Schedule of Intangible Assets [Line Items]
Balance, beginning of period			4,011
Finite-lived intangible assets acquired					0
Amortization expense			(1,119)
Balance at end of period	2,892		2,892		4,011
Gross carrying amount						18,206
Accumulated amortizations						(15,314)
Net book value	2,892		4,011		4,011	2,892
Trade names intangible
Schedule of Intangible Assets [Line Items]
Balance, beginning of period			744
Finite-lived intangible assets acquired					0
Amortization expense			(97)
Balance at end of period	647		647		744
Gross carrying amount						1,380
Accumulated amortizations						(733)
Net book value	647		744		744	647
Customer list intangible
Schedule of Intangible Assets [Line Items]
Balance, beginning of period			103
Finite-lived intangible assets acquired					125
Amortization expense			(11)
Balance at end of period	217		217		103
Gross carrying amount						455
Accumulated amortizations						(238)
Net book value	$ 217		$ 103		$ 103	$ 217

Goodwill and Intangible Asset61

Goodwill and Intangible Assets Textual References (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule of Intangible Assets [Line Items]
Goodwill, impairment loss	$ 0
Goodwill	64,654	$ 64,654
Trade names intangible
Schedule of Intangible Assets [Line Items]
Impairment of indefinite-lived trade name intangible	$ 0

Other Assets (Details)

Other Assets (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Other Assets [Abstract]
Federal Home Loan Bank stock	$ 14,748,000	$ 11,324,000
Prepaid expense	1,954,000	2,992,000
Mortgage Servicing Rights	2,589,000	2,316,000
Federal & state income taxes receivable, current	0	3,120,000
Accounts receivable & other miscellaneous assets	7,722,000	3,009,000
Other assets	27,013,000	22,761,000
Investment in Federal Home Loan Bank Stock
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Weighted Average Cost	1.40%	0.73%
Short-term debt	$ 127,467	$ 97,229
Available-for-sale securities pledged as collateral	235,200	237,400
Federal Reserve Bank advances
Short-term Debt [Line Items]
Short-term debt	0	0
Unsercured line of credit, maximum borrowing capacity	11,400	11,536
Available-for-sale securities pledged as collateral	$ 12,700	$ 12,800
Federal funds purchased
Short-term Debt [Line Items]
Weighted Average Cost	2.10%	1.77%
Short-term debt	$ 52,421	$ 1,000
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Weighted Average Cost	0.91%	0.71%
Short-term debt	$ 75,046	$ 96,229
Line of credit
Short-term Debt [Line Items]
Short-term debt	0
Unsercured line of credit, maximum borrowing capacity	$ 5,000
Debt Instrument, Issuance Date	Apr. 30, 2015
Debt instrument, maturity date	Apr. 30, 2019
London Interbank Offered Rate (LIBOR) | Line of credit
Short-term Debt [Line Items]
Description of variable interest rate basis	one-month LIBOR
Debt instrument, basis spread on variable rate	2.00%

Junior Subordinated Notes Iss64

Junior Subordinated Notes Issued to Capital Trusts (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Junior subordinated notes issued to capital trusts, book value		$ 23,841	$ 23,793
Junior subordinated notes
Debt Instrument [Line Items]
Junior subordinated debenture owed to unconsolidated subsidiary trust, face value	[1]	24,743	24,743
Junior subordinated notes issued to capital trusts, book value		23,841	23,793
Junior subordinated notes | CBI Capital Trust II
Debt Instrument [Line Items]
Junior subordinated debenture owed to unconsolidated subsidiary trust, face value	[1],[2]	7,217	7,217
Junior subordinated notes issued to capital trusts, book value	[1],[2]	$ 6,702	$ 6,674
Interest rate	[1],[2]	5.84%	5.09%
Debt instrument, maturity date	[1],[2]	Mar. 15, 2038	Mar. 15, 2038
Debt instrument, earliest call date	[1],[2]	Mar. 15, 2013	Mar. 15, 2013
Junior subordinated notes | CBI Capital Trust II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Description of variable interest rate basis	[1],[2]	Three-month LIBOR
Debt instrument, basis spread on variable rate	[1],[2]	3.50%
Junior subordinated notes | Barron Investment Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debenture owed to unconsolidated subsidiary trust, face value	[1],[2]	$ 2,062	$ 2,062
Junior subordinated notes issued to capital trusts, book value	[1],[2]	$ 1,675	$ 1,655
Interest rate	[1],[2]	4.49%	3.82%
Debt instrument, maturity date	[1],[2]	Sep. 23, 2036	Sep. 23, 2036
Debt instrument, earliest call date	[1],[2]	Sep. 23, 2011	Sep. 23, 2011
Junior subordinated notes | Barron Investment Capital Trust I | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Description of variable interest rate basis	[1],[2]	Three-month LIBOR
Debt instrument, basis spread on variable rate	[1],[2]	2.15%
Junior subordinated notes | MidWestOne Statutory Trust II
Debt Instrument [Line Items]
Junior subordinated debenture owed to unconsolidated subsidiary trust, face value	[1]	$ 15,464	$ 15,464
Junior subordinated notes issued to capital trusts, book value	[1]	$ 15,464	$ 15,464
Interest rate	[1]	3.93%	3.18%
Debt instrument, maturity date	[1]	Dec. 15, 2037	Dec. 15, 2037
Debt instrument, earliest call date	[1]	Dec. 15, 2012	Dec. 15, 2012
Junior subordinated notes | MidWestOne Statutory Trust II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Description of variable interest rate basis	[1]	Three-month LIBOR
Debt instrument, basis spread on variable rate	[1]	1.59%
Maximum
Debt Instrument [Line Items]
Junior subordinated debenture owed to unconsolidated subsidiary, deferral period		5 years
[1]	(1) All distributions are cumulative and paid in cash quarterly.
[2]	(2) Central Bancshares Capital Trust II and Barron Investment Capital Trust I were established by Central prior to the Company’s merger with Central, and the junior subordinated notes issued by Central were assumed by the Company.

Federal Home Loan Bank Borrow65

Federal Home Loan Bank Borrowings and Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2015	Apr. 30, 2015
Debt Instrument [Line Items]
Long-term debt, excluding subordinated debt, weighted average interest rate	2.23%	1.88%
Long-term Debt, Gross	$ 153,000	$ 127,500
Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
Weighted average cost	2.12%	1.72%
Long-term Debt, Gross	$ 143,000	$ 115,000
Federal Home Loan, Bank advances general debt obligations, disclosures maximum borrowing capacity as percentage of total assets	35.00%
Note payable to unaffiliated bank
Debt Instrument [Line Items]
Weighted average cost	3.75%	3.32%
Long-term Debt, Gross	$ 10,000	$ 12,500
Debt Instrument, Issuance Date		Apr. 30, 2015
Original note face amount				$ 35,000
Debt instrument, maturity date		Jun. 30, 2020
Long-term debt, amount advanced			$ 25,000
Debt instrument, frequency of periodic payment	quarterly
Debt Instrument, Date of First Required Payment		Sep. 30, 2015

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax based on statutory rate, amount	$ 2,160	$ 3,629	$ 4,213	$ 6,864
Tax-exempt interest, amount	(501)	(795)	(991)	(1,581)
Bank-owned life insurance, amount	(82)	(110)	(173)	(225)
State income taxes, net of federal income tax benefit, amount	566	443	1,095	848
General business credits, amount	7	(19)	(40)	(40)
Other, amount	(19)	(12)	11	(201)
Total income tax expense, amount	$ 2,131	$ 3,136	$ 4,115	$ 5,665
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax based on statutory amount, percent	21.00%	35.00%	21.00%	35.00%
Tax-exempt interest, percent	(4.90%)	(7.70%)	(4.90%)	(8.10%)
Bank-owned life insurance, percent	(0.80%)	(1.10%)	(0.90%)	(1.10%)
State income taxes, net of federal income tax benefit, percent	5.50%	4.30%	5.40%	4.30%
General business credits, percent	(1.00%)	(0.20%)	(0.70%)	(0.20%)
Other, percent	0.90%	(0.10%)	0.60%	(1.00%)
Total income tax provision, percent	20.70%	30.20%	20.50%	28.90%

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 8,156	$ 7,234	$ 15,949	$ 13,947
Average number of shares outstanding	12,218,240	12,200,689	12,220,453	11,855,108
Earnings per common share - basic	$ 0.67	$ 0.59	$ 1.31	$ 1.18
Diluted average number of shares	12,229,940	12,219,238	12,235,405	11,878,315
Earnings per common share - diluted	$ 0.67	$ 0.59	$ 1.30	$ 1.17

Estimated Fair Value of Finan68

Estimated Fair Value of Financial Instruments and Fair Value Measurements Fair Value Financial Assets and Liabilities Measured on a Recurring Basis (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)count	Dec. 31, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 438,312	$ 445,324
Transfer of assets, fair value, to (from) Level 3, amount	0	0
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	0
Derivative liabilities	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	113
Derivative liabilities	158
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	0
Derivative liabilities	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	113
Derivative liabilities	158
Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	0
Derivative liabilities	0
Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	113
Derivative liabilities	158
Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets	0
Derivative liabilities	0
U.S. Government agencies and corporations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	5,543	15,626
U.S. Government agencies and corporations | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	5,543	15,626
U.S. Government agencies and corporations | Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	5,543	15,626
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	141,715	141,839
State and political subdivisions | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	141,715	141,839
State and political subdivisions | Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	141,715	141,839
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	54,370	48,497
Mortgage-backed securities | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	54,370	48,497
Mortgage-backed securities | Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	54,370	48,497
Collateralized mortgage obligations | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	172,010	168,196
Collateralized mortgage obligations | Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	172,010	168,196
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	64,674	71,166
Corporate debt securities | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	64,674	71,166
Corporate debt securities | Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 64,674	71,166
Debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Sample size used to validate pricing service results | count	30
Debt securities | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 438,312	445,324
Debt securities | Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 438,312	$ 445,324

Estimated Fair Value of Finan69

Estimated Fair Value of Financial Instruments and Fair Value Measurements Fair Value Assets and Liabilities Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	$ 676	$ 2,010
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Collateral dependent impaired loans	6,169	3,927
Other real estate owned	676	2,010
Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Collateral dependent impaired loans	6,169	3,927
Other real estate owned	$ 676	$ 2,010

Estimated Fair Value of Finan70

Estimated Fair Value of Financial Instruments and Fair Value Measurements Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment securities:
Equity securities	$ 2,809	$ 2,336
Debt securities available for sale	438,312	445,324
Debt securities held to maturity securities	192,896	195,619
Debt securities held to maturity, estimated fair value	188,407	194,343
Interest receivable	13,636	14,732
Federal Home Loan Bank stock	14,748	11,324
Deposits:
Non-interest-bearing demand	469,862	461,969
Interest-bearing checking	1,183,384	1,228,112
Savings	216,866	213,430
Reported Value Measurement
Financial Assets
Cash and cash equivalents	43,264	50,972
Investment securities:
Equity securities	2,809	2,336
Debt securities available for sale	438,312	445,324
Debt securities held to maturity securities	192,896	195,619
Total investment securities	634,017	643,279
Loans held for sale	1,528	856
Loans held for investment, net	2,333,235	2,258,636
Interest receivable	13,636	14,732
Derivative assets	113
Deposits:
Non-interest-bearing demand	469,862	461,969
Interest-bearing checking	1,183,384	1,228,112
Savings	216,866	213,430
Certificates of deposit under $100,000	341,584	324,681
Certificates of deposit $100,000 and over	392,505	377,127
Total deposits	2,604,201	2,605,319
Federal funds purchased and securities sold under agreements to repurchase	127,467	97,229
Federal Home Loan Bank borrowings	143,000	115,000
Junior subordinated notes issued to capital trusts	23,841	23,793
Long-term debt	10,000	12,500
Derivative liabilities	158
Estimate of Fair Value Measurement
Financial Assets
Cash and cash equivalents	43,264	50,972
Investment securities:
Equity securities	2,809	2,336
Debt securities available for sale	438,312	445,324
Debt securities held to maturity, estimated fair value	188,407	194,343
Total investment securities	629,528	642,003
Loans held for sale	1,548	871
Loans held for investment, net	2,268,777	2,256,726
Interest receivable	13,636	14,732
Federal Home Loan Bank stock	14,748	11,324
Derivative assets	113
Deposits:
Non-interest-bearing demand	469,862	461,969
Interest-bearing checking	1,183,384	1,228,112
Savings	216,866	213,430
Certificates of deposit under $100,000	336,859	321,197
Certificates of deposit $100,000 and over	388,913	374,685
Total deposits	2,595,884	2,599,393
Federal funds purchased and securities sold under agreements to repurchase	127,467	97,229
Federal Home Loan Bank borrowings	141,069	114,945
Junior subordinated notes issued to capital trusts	21,032	19,702
Long-term debt	10,000	12,500
Derivative liabilities	158
Fair Value, Inputs, Level 1
Financial Assets
Cash and cash equivalents	43,264	50,972
Investment securities:
Equity securities	2,809	2,336
Total investment securities	2,809	2,336
Interest receivable	13,636	14,732
Derivative assets	0
Deposits:
Non-interest-bearing demand	469,862	461,969
Interest-bearing checking	1,183,384	1,228,112
Savings	216,866	213,430
Total deposits	1,870,112	1,903,511
Federal funds purchased and securities sold under agreements to repurchase	127,467	97,229
Derivative liabilities	0
Fair Value, Inputs, Level 2
Investment securities:
Equity securities	0	0
Debt securities available for sale	438,312	445,324
Debt securities held to maturity, estimated fair value	188,407	194,343
Total investment securities	626,719	639,667
Loans held for sale	1,548
Loans held for investment, net		2,256,726
Federal Home Loan Bank stock	14,748	11,324
Derivative assets	113
Deposits:
Certificates of deposit under $100,000	336,859	321,197
Certificates of deposit $100,000 and over	388,913	374,685
Total deposits	725,772	695,882
Federal Home Loan Bank borrowings	141,069	114,945
Junior subordinated notes issued to capital trusts	21,032	19,702
Long-term debt	10,000	12,500
Derivative liabilities	158
Fair Value, Inputs, Level 3
Investment securities:
Equity securities	0	0
Loans held for sale		$ 871
Loans held for investment, net	2,268,777
Derivative assets	0
Deposits:
Derivative liabilities	$ 0

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions	Jul. 26, 2018	Jul. 17, 2018
Common Stock
Subsequent Event
Dividends payable, amount per share		$ 0.195
Dividends payable, date to be paid		Sep. 17, 2018
Dividends payable, date of record		Sep. 1, 2018
Land, Buildings and Improvements [Member]
Subsequent Event
Former branch office impairment charge	$ 0.5