Franklin Financial Network (FSB) 10-Q 6 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 01, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	FSB
Entity Registrant Name	FRANKLIN FINANCIAL NETWORK INC.
Entity Central Index Key	0001407067
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity File Number	001-36895
Entity Tax Identification Number	208839445
Entity Address, Address Line One	722 Columbia Avenue
Entity Address, City or Town	Franklin
Entity Address, State or Province	Tennessee
Entity Address, Postal Zip Code	37064
City Area Code	615
Local Phone Number	236-2265
Entity Common Stock, Shares Outstanding		14,624,960

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
ASSETS
Cash and due from financial institutions	$ 150,721	$ 280,212
Certificates of deposit at other financial institutions	3,840	3,594
Securities available for sale	715,132	1,030,668
Securities held to maturity (fair value 2019—$120,809 and 2018—$118,955)	118,963	121,617
Loans held for sale, at fair value	27,093	11,103
Loans held for investment	2,880,433	2,665,399
Allowance for loan losses	(27,443)	(23,451)
Net loans	2,852,990	2,641,948
Restricted equity securities, at cost	24,842	21,831
Premises and equipment, net	12,948	12,371
Accrued interest receivable	14,281	13,337
Bank owned life insurance	55,989	55,239
Deferred tax asset	10,451	13,189
Servicing rights, net	3,299	3,403
Goodwill	18,176	18,176
Core deposit intangible, net	675	952
Other assets	62,571	21,799
Total assets	4,071,971	4,249,439
Deposits
Non-interest bearing	334,802	290,580
Interest bearing	2,811,843	3,141,227
Total deposits	3,146,645	3,431,807
Federal Home Loan Bank advances	396,500	368,500
Subordinated notes, net	58,782	58,693
Accrued interest payable	4,312	4,700
Other liabilities	72,123	12,906
Total liabilities	3,678,362	3,876,606
Commitments and Contingencies (Note 9)
Equity
Preferred stock, no par value: 1.0 million shares authorized; no shares outstanding at June 30, 2019 and December 31, 2018
Common stock, no par value: 30.0 million authorized; 14.6 million and 14.5 million issued and outstanding at June 30, 2019 and December 31, 2018, respectively	268,505	264,905
Retained earnings	127,840	123,176
Accumulated other comprehensive loss	(2,829)	(15,341)
Total shareholders’ equity	393,516	372,740
Non-controlling interest in consolidated subsidiary	93	93
Total equity	393,609	372,833
Total liabilities and equity	$ 4,071,971	$ 4,249,439

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Held-to-maturity securities, fair value	$ 120,809	$ 118,955
Preferred stock, no par value
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, no par value
Common stock shares authorized	30,000,000	30,000,000
Common stock shares issued	14,600,000	14,500,000
Common stock shares outstanding	14,600,000	14,500,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income and dividends
Loans, including fees	$ 40,202	$ 32,312	$ 78,540	$ 61,105
Securities:
Taxable	4,614	6,905	11,008	13,016
Tax-Exempt	1,410	1,929	2,880	3,844
Dividends on restricted equity securities	350	329	684	603
Federal funds sold and other	877	661	1,864	1,615
Total interest income	47,453	42,136	94,976	80,183
Interest expense
Deposits	16,679	12,604	33,669	23,247
Federal funds purchased and repurchase agreements	90	131	162	227
Federal Home Loan Bank advances and other borrowings	2,237	1,414	4,196	2,524
Subordinated notes	1,082	1,082	2,164	2,164
Total interest expense	20,088	15,231	40,191	28,162
Net interest income	27,365	26,905	54,785	52,021
Provision for loan losses	7,031	570	12,086	1,143
Net interest income after provision for loan losses	20,334	26,335	42,699	50,878
Noninterest income
Gain on sale or call of securities	367	1	517	1
Net (loss) gain on sale of loans	3		(214)
Total noninterest income	4,923	4,147	8,410	7,603
Noninterest expense
Salaries and employee benefits	11,365	10,268	26,108	19,456
Occupancy and equipment	3,283	2,885	6,396	5,479
FDIC assessment expense	660	778	1,650	1,438
Marketing	301	269	620	549
Professional fees	1,073	1,362	1,996	2,231
Amortization of core deposit intangible	132	182	277	286
Other	2,556	2,306	4,939	4,099
Total noninterest expense	19,370	18,050	41,986	33,538
Income before income tax expense	5,887	12,432	9,123	24,943
Income tax expense	706	2,263	1,040	4,722
Net income	5,181	10,169	8,083	20,221
Earnings attributable to noncontrolling interest	(8)	(8)	(8)	(8)
Net income available to common shareholders	$ 5,173	$ 10,161	$ 8,075	$ 20,213
Earnings per share:
Basic	$ 0.35	$ 0.71	$ 0.55	$ 1.46
Diluted	$ 0.34	$ 0.68	$ 0.54	$ 1.41
Service charges on deposit accounts [Member]
Noninterest income
Total noninterest income	$ 77	$ 51	$ 151	$ 93
Other Service Charges and Fees [Member]
Noninterest income
Total noninterest income	903	823	1,660	1,574
Mortgage Banking Revenue [Member]
Noninterest income
Total noninterest income	2,473	2,044	4,145	3,602
Wealth Management [Member]
Noninterest income
Total noninterest income	673	789	1,300	1,493
Net gain on sale of foreclosed assets [Member]
Noninterest income
Total noninterest income	3	3	7	6
Other [Member]
Noninterest income
Total noninterest income	$ 424	$ 436	$ 844	$ 834

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,181	$ 10,169	$ 8,083	$ 20,221
Unrealized gains/losses on securities:
Unrealized holding gain (loss) arising during the period	7,116	(3,774)	19,109	(18,351)
Reclassification adjustment for losses (gains) included in net income	(367)	(1)	(517)	(1)
Tax effect	(1,760)	988	(4,849)	4,796
Net of tax	4,989	(2,787)	13,743	(13,556)
Unrealized gain/loss on cash flow hedge:
Unrealized holding gain (loss)	(1,667)		(1,667)
Tax effect	436		436
Net of tax	(1,231)		(1,231)
Total other comprehensive income (loss)	3,758	(2,787)	12,512	(13,556)
Comprehensive income	$ 8,939	$ 7,382	$ 20,595	$ 6,665

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2017	$ 304,653	$ 222,665	$ 88,671	$ (6,786)	$ 103
Beginning balance, shares at Dec. 31, 2017		13,237,128
Exercise of common stock options, includes net settlement of shares	1,937	$ 1,937
Exercise of common stock options, includes net settlement of shares, number of shares		157,231
Stock based compensation expense, net of restricted share forfeitures	2,078	$ 2,078
Stock issued in conjunction with 401(k) employer match, net of distributions	(95)	$ (95)
Stock issued in conjunction with 401(k) employer match, net of distributions, shares		(2,815)
Issuance of restricted stock, net of forfeitures, shares		118,306
Stock issued for acquisition (net of issuance costs)	32,932	$ 32,932
Stock issued for acquisition, net of issuance costs, shares		970,390
Noncontrolling interest distributions	(8)		(8)
Net income	20,221		20,221
Other comprehensive income (loss)	(13,556)			(13,556)
Ending balance at Jun. 30, 2018	348,162	$ 259,517	108,884	(20,342)	103
Ending balance, shares at Jun. 30, 2018		14,480,240
Beginning balance at Mar. 31, 2018	304,865	$ 223,594	98,723	(17,555)	103
Beginning balance, shares at Mar. 31, 2018		13,258,142
Exercise of common stock options, includes net settlement of shares	1,717	$ 1,717
Exercise of common stock options, includes net settlement of shares, number of shares		135,883
Stock based compensation expense, net of restricted share forfeitures	1,319	$ 1,319
Stock issued in conjunction with 401(k) employer match, net of distributions	(45)	$ (45)
Stock issued in conjunction with 401(k) employer match, net of distributions, shares		(2,481)
Issuance of restricted stock, net of forfeitures, shares		118,306
Stock issued for acquisition (net of issuance costs)	32,932	$ 32,932
Stock issued for acquisition, net of issuance costs, shares		970,390
Noncontrolling interest distributions	(8)		(8)
Net income	10,169		10,169
Other comprehensive income (loss)	(2,787)			(2,787)
Ending balance at Jun. 30, 2018	348,162	$ 259,517	108,884	(20,342)	103
Ending balance, shares at Jun. 30, 2018		14,480,240
Cumulative-effect of accounting change	(2,244)		(2,244)
Balance at January 1, 2019, adjusted	370,589	$ 264,905	120,932	(15,341)	93
Adjusted balance, shares		14,538,085
Beginning balance at Dec. 31, 2018	372,833	$ 264,905	123,176	(15,341)	93
Beginning balance, shares at Dec. 31, 2018		14,538,085
Exercise of common stock options, includes net settlement of shares	1,277	$ 1,277
Exercise of common stock options, includes net settlement of shares, number of shares		109,162
Stock based compensation expense, net of restricted share forfeitures	2,842	$ 2,842
Issuance of restricted stock, net of forfeitures, shares		220
Purchase of treasury stock	(519)	$ (519)
Purchase of treasury stock, shares		(19,180)
Cash dividends - common stock($0.04 and $0.08 per share)	(1,167)		(1,167)
Noncontrolling interest distributions	(8)		(8)
Net income	8,083		8,083
Other comprehensive income (loss)	12,512			12,512
Ending balance at Jun. 30, 2019	393,609	$ 268,505	127,840	(2,829)	93
Ending balance, shares at Jun. 30, 2019		14,628,287
Beginning balance at Mar. 31, 2019	383,514	$ 266,758	123,250	(6,587)	93
Beginning balance, shares at Mar. 31, 2019		14,574,339
Exercise of common stock options, includes net settlement of shares	753	$ 753
Exercise of common stock options, includes net settlement of shares, number of shares		74,116
Stock based compensation expense, net of restricted share forfeitures	1,513	$ 1,513
Issuance of restricted stock, net of forfeitures, shares		(988)
Purchase of treasury stock	(519)	$ (519)
Purchase of treasury stock, shares		(19,180)
Cash dividends - common stock($0.04 and $0.08 per share)	(583)		(583)
Noncontrolling interest distributions	(8)		(8)
Net income	5,181		5,181
Other comprehensive income (loss)	3,758			3,758
Ending balance at Jun. 30, 2019	$ 393,609	$ 268,505	$ 127,840	$ (2,829)	$ 93
Ending balance, shares at Jun. 30, 2019		14,628,287

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Statement Of Stockholders Equity [Abstract]
Common stock dividends, Per share	$ 0.04	$ 0.08

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 8,083	$ 20,221
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization on premises and equipment	850	841
Accretion of purchase accounting adjustments	(346)	(610)
Net amortization of securities	3,078	4,073
Amortization of loan servicing right asset	487	441
Amortization of core deposit intangible	277	286
Amortization of debt issuance costs	89	89
Provision for loan losses	12,086	1,143
Deferred income tax benefit	(2,121)	(216)
Excess tax benefit related to stock compensation	(205)
Origination of loans held for sale	(208,009)	(184,835)
Proceeds from sale of loans held for sale	197,230	183,113
Loss (gain) on sale of loans held for investment	227
Net gain on sale of loans held for sale	(5,594)	(3,380)
Gain on sale of available for sale securities	(517)	(1)
Income from bank owned life insurance	(750)	(762)
Stock-based compensation	2,842	2,078
Deferred gain on sale of loans	(7)	(8)
Deferred gain on sale of foreclosed assets	(7)	(6)
Net change in:
Accrued interest receivable and other assets	4,478	(2,153)
Accrued interest payable and other liabilities	6,875	(3,327)
Net cash from operating activities	19,046	16,987
Securities available for sale :
Sales and calls	347,037	1
Purchases	(94,860)	(226,362)
Maturities and prepayments	82,556	87,779
Securities held to maturity :
Purchases	(3,284)	(1,676)
Maturities, prepayments and calls	5,261	6,393
Net change in loans	(241,477)	(118,539)
Proceeds from sale of loans held for investment	18,468
Purchase of restricted equity securities	(3,011)	(1,165)
Purchases of premises and equipment, net	(1,427)	(885)
Increase in certificates of deposits at other financial institutions	(246)
Purchase of bank owned life insurance		(119)
Net cash acquired from acquisition		24,660
Net cash from investing activities	109,017	(229,914)
Cash flows from financing activities
(Decrease) increase in deposits	(285,162)	107,635
Increase (decrease) in federal funds purchased and repurchase agreements		(30,659)
Proceeds from Federal Home Loan Bank advances	340,000	250,000
Repayment of Federal Home Loan Bank advances	(312,000)	(182,000)
Proceeds from issuance of common stock, net of offering costs		(242)
Proceeds from exercise of common stock options	1,277	1,937
Divestment of common stock issued to 401(k) plan		(95)
Purchase of treasury stock	(494)
Dividends paid on common stock	(1,167)
Noncontrolling interest distributions	(8)	(8)
Net cash from financing activities	(257,554)	146,568
Net change in cash and cash equivalents	(129,491)	(66,359)
Cash and cash equivalents at beginning of period	280,212	251,543
Cash and cash equivalents at end of period	150,721	185,184
Supplemental information:
Interest paid	40,579	27,004
Income taxes paid	6,043	6,632
Non-cash supplemental information:
Fair value of stock and stock options issued related to Civic Bank acquisition		33,174
Transfers from loans to foreclosed assets		$ 350
Establishment of lease liability and right-of use asset	43,723
Transfers from securities available for sale to securities held to maturity	$ 1,206

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	NOTE 1—BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements have been prepared in accordance with instructions to Form 10-Q and therefore do not include all information and footnotes necessary for a complete presentation of financial position, results of operations, and cash flows in conformity with U.S. generally accepted accounting principles (U.S. GAAP). All adjustments which are, in the opinion of management, necessary for a fair presentation of the results for the periods reported have been included as required by Regulation S-X, Rule 10-01. All such adjustments are of a normal recurring nature. It is suggested that these interim consolidated financial statements and notes be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 19, 2019. These consolidated financial statements include the accounts of Franklin Financial Network, Inc. (“FFN”), and its wholly-owned subsidiaries, Franklin Synergy Bank (“Franklin Synergy” or the “Bank”) and Franklin Synergy Risk Management, Inc. (collectively, the “Company”). Franklin Synergy Investments of Tennessee, Inc., Franklin Synergy Investments of Nevada, Inc., and Franklin Synergy Preferred Capital, Inc. are direct or indirect subsidiaries of the Bank and are included in these consolidated financial statements. Significant intercompany transactions and accounts are eliminated in consolidation. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, Leases The guidance requires that a lessee should now recognize lease assets and lease liabilities for operating leases. In July 2016, the FASB issued Accounting Standards Update 2018-10, Codification Improvements to Topic 842, Leases Accounting Standards Update 2018-11, Leases (Topic 842): Targeted Improvements In March 2019, the FASB issued ASU No. 2019-01, “Leases: Codification Improvements” which addresses lessors and clarifies the transition guidance related to certain interim disclosures provided in the year of adoption. right of use asset and lease liability of $43,723. See Note 5 - Leases for more information. In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities In October 2018, the FASB issued ASU 2018-16, “Derivatives and Hedging (Topic 815) - Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes.” Recent Accounting Pronouncements Not Yet Adopted In June 2016, FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ASU 2016-13 ASU No. 2018-19 Codification Improvements to Topic 326 Financial Instruments—Credit Losses ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, and ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326) Targeted Transition Relief . In January 2017, the FASB issued ASU 2017-04, “ Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In August 2018, the FASB issued ASU No. 2018-13, “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” In August 2018, the FASB issued ASU 2018-15, “ Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract .” ASU 2018-15 clarifies certain aspects of ASU 2015-05, “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement,” which was issued in April 2015. Specifically, ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). ASU 2018-15 does not affect the accounting for the service element of a hosting arrangement that is a service contract. ASU 2018-15 will be effective for the Company on January 1, 2020, with early adoption permitted, and is not expected to have a significant impact on our financial statements.

Securities

Securities	6 Months Ended
	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Securities	NOTE 2—SECURITIES The following table summarizes the amortized cost and fair value of the securities available for sale portfolio at June 30, 2019 and December 31, 2018 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value June 30, 2019 U.S. government sponsored entities and agencies $ 1,695 1 (8 ) $ 1,688 Mortgage-backed securities: residential 476,378 1,417 (3,744 ) 474,051 Mortgage-backed securities: commercial 18,544 275 (120 ) 18,699 Asset-backed securities 25,746 27 (565 ) 25,208 Corporate notes 22,360 356 — 22,716 State and political subdivisions 172,585 279 (94 ) 172,770 Total $ 717,308 $ 2,355 $ (4,531 ) $ 715,132 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2018 U.S. Treasury securities $ 253,015 $ 59 $ (60 ) $ 253,014 U.S. government sponsored entities and agencies 21,999 1 (112 ) 21,888 Mortgage-backed securities: residential 596,766 27 (16,094 ) 580,699 Asset-backed securities 25,744 — (900 ) 24,844 Corporate notes 12,480 21 (77 ) 12,424 State and political subdivisions 141,432 863 (4,496 ) 137,799 Total $ 1,051,436 $ 971 $ (21,739 ) $ 1,030,668 The amortized cost and fair value of the securities held to maturity portfolio at June 30, 2019 and December 31, 2018 and the corresponding amounts of gross unrecognized gains and losses were as follows: Amortized Cost Gross Unrecognized Gains Gross Unrecognized Losses Fair Value June 30, 2019 Mortgage backed securities: residential $ 74,163 $ 198 $ (1,029 ) $ 73,332 State and political subdivisions 44,800 2,677 — 47,477 Total $ 118,963 $ 2,875 $ (1,029 ) $ 120,809 December 31, 2018 Mortgage backed securities: residential $ 75,944 $ 34 $ (3,072 ) $ 72,906 State and political subdivisions 45,673 466 (90 ) 46,049 Total $ 121,617 $ 500 $ (3,162 ) $ 118,955 The proceeds from sales and calls of securities available for sale and the associated gains and losses were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Proceeds $ 87,424 $ 1 $ 347,037 $ 1 Gross gains 367 1 2,168 1 Gross losses — — (1,651 ) — The amortized cost and fair value of the investment securities portfolio are shown by contractual maturity. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. June 30, 2019 Amortized Cost Fair Value Available for sale One year or less $ 10,502 $ 10,498 Over one year through five years 697 697 Over five years through ten years 27,586 28,033 Over ten years 157,855 157,946 Asset-backed securities 25,746 25,208 Mortgage-backed securities: residential 476,378 474,051 Mortgage-backed securities: commercial 18,544 18,699 Total $ 717,308 $ 715,132 Held to maturity Over one year through five years 1,106 1,138 Over five years through ten years 1,034 1,076 Over ten years 42,660 45,263 Mortgage-backed securities: residential 74,163 73,332 Total $ 118,963 $ 120,809 Securities pledged at June 30, 2019 and December 31, 2018 had a carrying amount of $468,429 and $939,440, respectively, and were pledged to secure public deposits. At June 30, 2019 and December 31, 2018, there were no holdings of securities of any one issuer, other than the U.S. government-sponsored entities and agencies, in an amount greater than 10% of shareholders’ equity. The following table summarizes the securities with unrealized and unrecognized losses at June 30, 2019 and December 31, 2018, aggregated by major security type and length of time in a continuous unrealized loss position: Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses June 30, 2019 Available for sale U.S. government sponsored entities and agencies $ 48 $ — $ 483 $ (8 ) $ 531 $ (8 ) Mortgage-backed securities: residential 8,385 (44 ) 329,225 (3,700 ) 337,610 (3,744 ) Mortgage-backed securities: commercial — — 7,532 (120 ) 7,532 (120 ) Asset-backed securities 22,713 (565 ) — — 22,713 (565 ) State and political subdivisions 9,996 (4 ) 30,152 (90 ) 40,148 (94 ) Total available for sale $ 41,142 $ (613 ) $ 367,392 $ (3,918 ) $ 408,534 $ (4,531 ) Less Than 12 Months 12 Months or Longer Total Fair Value Unrecognized Losses Fair Value Unrecognized Losses Fair Value Unrecognized Losses Held to maturity Mortgage-backed securities: residential $ 1,639 $ (6 ) $ 59,548 $ (1,023 ) $ 61,187 $ (1,029 ) Total held to maturity $ 1,639 $ (6 ) $ 59,548 $ (1,023 ) $ 61,187 $ (1,029 ) Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2018 Available for sale U.S. Treasury securities $ 163,722 $ (60 ) $ — $ — $ 163,722 $ (60 ) U.S. government sponsored entities and agencies 1,355 (12 ) 19,937 (100 ) 21,292 (112 ) Mortgage-backed securities: residential 83,203 (755 ) 490,752 (15,339 ) 573,955 (16,094 ) Asset-backed securities 24,845 (900 ) — — 24,845 (900 ) Corporate 9,839 (77 ) — — 9,839 (77 ) State and political subdivisions 10,446 (106 ) 69,238 (4,390 ) 79,684 (4,496 ) Total available for sale $ 293,410 $ (1,910 ) $ 579,927 $ (19,829 ) $ 873,337 $ (21,739 ) Less Than 12 Months 12 Months or Longer Total Fair Value Unrecognized Losses Fair Value Unrecognized Losses Fair Value Unrecognized Losses Held to maturity Mortgage-backed securities: residential $ 2,239 $ (40 ) $ 68,067 $ (3,032 ) $ 70,306 $ (3,072 ) State and political subdivisions 8,362 (39 ) 3,675 (51 ) 12,037 (90 ) Total held to maturity $ 10,601 $ (79 ) $ 71,742 $ (3,083 ) $ 82,343 $ (3,162 ) Unrealized losses on debt securities have not been recognized into income because the issuers’ bonds are of high credit quality (rated AA or higher). As of June 30, 2019, management does not intend to sell and it is more likely than not that management will not be required to sell the securities prior to their anticipated recovery, and the decline in fair value is largely due to changes in interest rates and other market conditions. The fair value is expected to recover as the bonds approach maturity.

Loans

Loans	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Loans	NOTE 3—LOANS Loans at June 30, 2019 and December 31, 2018 were as follows: June 30, 2019 December 31, 2018 Loans Construction and land development $ 584,599 $ 584,440 Commercial real estate: Nonfarm, nonresidential 894,910 754,243 Other 37,845 48,017 Residential real estate: Closed-end 1-4 family 496,597 493,065 Other 197,549 189,817 Commercial and industrial 668,065 592,793 Consumer and other 4,945 5,568 Loans before net deferred loan fees 2,884,510 2,667,943 Deferred loan fees, net (4,077 ) (2,544 ) Total loans 2,880,433 2,665,399 Allowance for loan losses (27,443 ) (23,451 ) Total loans, net of allowance for loan losses $ 2,852,990 $ 2,641,948 The following table presents the activity in the allowance for loan losses by portfolio segment for the three-month periods ended June 30, 2019 and 2018: Construction and Land Development Commercial Real Estate Residential Real Estate Commercial and Industrial Consumer and Other Total Three Months Ended June 30, 2019 Allowance for loan losses: Beginning balance $ 4,742 $ 7,027 $ 4,810 $ 11,229 $ 49 $ 27,857 Provision for loan losses 42 614 18 6,382 (25 ) 7,031 Loans charged-off — — — (7,563 ) (29 ) (7,592 ) Recoveries — — 16 70 61 147 Total ending allowance balance $ 4,784 $ 7,641 $ 4,844 $ 10,118 $ 56 $ 27,443 Three Months Ended June 30, 2018 Allowance for loan losses: Beginning balance $ 4,345 $ 5,875 $ 3,605 $ 7,866 $ 47 $ 21,738 Provision for loan losses 267 288 909 (900 ) 6 570 Loans charged-off — — — — (5 ) (5 ) Recoveries 1 — 19 10 8 38 Total ending allowance balance $ 4,613 $ 6,163 $ 4,533 $ 6,976 $ 56 $ 22,341 The following table presents the activity in the allowance for loan losses by portfolio segment for the six-month periods ended June 30, 2019 and 2018. Construction and Land Development Commercial Real Estate Residential Real Estate Commercial and Industrial Consumer and Other Total Six Months Ended June 30, 2019 Allowance for loan losses: Beginning balance $ 4,743 $ 6,725 $ 4,743 $ 7,166 $ 74 $ 23,451 Provision for loan losses 41 916 101 11,012 16 12,086 Loans charged-off — — (15 ) (8,131 ) (99 ) (8,245 ) Recoveries — — 15 71 65 151 Total ending allowance balance $ 4,784 $ 7,641 $ 4,844 $ 10,118 $ 56 $ 27,443 Six Months Ended June 30, 2018 Allowance for loan losses: Beginning balance $ 3,802 $ 5,981 $ 3,834 $ 7,587 $ 43 $ 21,247 Provision for loan losses 848 182 668 (572 ) 17 1,143 Loans charged-off (38 ) — (7 ) (49 ) (17 ) (111 ) Recoveries 1 — 38 10 13 62 Total ending allowance balance $ 4,613 $ 6,163 $ 4,533 $ 6,976 $ 56 $ 22,341 The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of June 30, 2019 and December 31, 2018. For purposes of this disclosure, recorded investment in loans excludes accrued interest receivable and net deferred loan fees due to immateriality. Construction and Land Development Commercial Real Estate Residential Real Estate Commercial and Industrial Consumer and Other Total June 30, 2019 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 2,193 $ — $ 2,193 Collectively evaluated for impairment 4,784 7,641 4,844 7,925 56 25,250 Total ending allowance balance $ 4,784 $ 7,641 $ 4,844 $ 10,118 $ 56 $ 27,443 Loans: Individually evaluated for impairment $ — $ — $ 1,837 $ 2,193 $ — $ 4,030 Collectively evaluated for impairment 584,599 932,755 692,309 665,872 4,945 2,880,480 Total ending loans balance $ 584,599 $ 932,755 $ 694,146 $ 668,065 $ 4,945 $ 2,884,510 December 31, 2018 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 17 $ — $ 17 Collectively evaluated for impairment 4,743 6,725 4,743 7,149 74 23,434 Total ending allowance balance $ 4,743 $ 6,725 $ 4,743 $ 7,166 $ 74 $ 23,451 Loans: Individually evaluated for impairment $ 2,298 $ — $ 3,189 $ 167 $ — $ 5,654 Collectively evaluated for impairment 582,142 802,260 679,693 592,626 5,568 2,662,289 Total ending loans balance $ 584,440 $ 802,260 $ 682,882 $ 592,793 $ 5,568 $ 2,667,943 Loans collectively evaluated for impairment reported at June 30, 2019 include certain acquired loans. At June 30, 2019, these non-PCI loans had a carrying value of $72,774, comprised of contractually unpaid principal totaling $73,717 and discounts totaling $943. Management evaluated these loans for credit deterioration since acquisition and determined that an allowance for loan losses of $115 was necessary at June 30, 2019. The following table presents information related to impaired loans by class of loans as of June 30, 2019 and December 31, 2018: Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated June 30, 2019 With no allowance recorded: Residential real estate: Closed-end 1-4 family $ 491 484 $ — Other 1,353 1,353 — Commercial and industrial — — — Subtotal 1,844 1,837 — With an allowance recorded: Commercial and industrial 5,722 2,193 2,193 Subtotal 5,722 2,193 2,193 Total $ 7,566 $ 4,030 $ 2,193 December 31, 2018 With no allowance recorded: Construction and land development $ 2,298 $ 2,298 $ — Residential real estate: Closed-end 1-4 family 1,280 1,272 — Other 1,917 1,917 — Subtotal 5,495 5,487 — With an allowance recorded: Commercial and industrial 167 167 17 Subtotal 167 167 17 Total $ 5,662 $ 5,654 $ 17 The following table presents the average recorded investment of impaired loans by class of loans for the three and six months ended June 30, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, Average Recorded Investment 2019 2018 2019 2018 With no allowance recorded: Construction and land development $ — $ — $ 384 $ 100 Commercial real estate: Nonfarm, nonresidential — — 25 — Residential real estate: Closed-end 1-4 family 681 496 744 432 Other 1,086 112 1,174 192 Commercial and industrial 2,638 883 1,319 867 Subtotal 4,405 1,491 3,646 1,591 With an allowance recorded: Construction and land development $ — $ — $ 91 $ — Commercial and industrial 4,404 1,638 3,787 1,785 Subtotal 4,404 1,638 3,878 1,785 Total average recorded investment $ 8,809 $ 3,129 $ 7,524 $ 3,376 The impact on net interest income for these loans was not material to the Company’s results of operations for the three and six months ended June 30, 2019 and 2018. The following table presents the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans as of June 30, 2019 and December 31, 2018: Nonaccrual Loans Past Due Over 90 Days And Still Accruing Interest June 30, 2019 Residential real estate: Closed-end 1-4 family $ 484 $ — Other 1,353 250 Commercial and industrial 2,193 426 Total $ 4,030 $ 676 December 31, 2018 Construction and land development $ 2,298 $ — Residential real estate: Closed-end 1-4 family 1,273 — Other 1,917 — Commercial and industrial — 208 Total $ 5,488 $ 208 Nonaccrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. The following table presents the aging of the recorded investment in past due loans as of June 30, 2019 and December 31, 2018 by class of loans: 30-59 Days Past Due 60-89 Days Past Due Greater Than 89 Days Past Due Total Past Due Loans Not Past Due Total June 30, 2019 Construction and land development $ — $ 380 $ — $ 380 $ 584,219 $ 584,599 Commercial real estate: Nonfarm, nonresidential — — — — 894,910 894,910 Other — — — — 37,845 37,845 Residential real estate: Closed-end 1-4 family 350 — 159 509 496,088 496,597 Other 218 404 609 1,231 196,318 197,549 Commercial and industrial 601 289 2,619 3,509 664,556 668,065 Consumer and other 33 — — 33 4,912 4,945 $ 1,202 $ 1,073 $ 3,387 $ 5,662 $ 2,878,848 $ 2,884,510 December 31, 2018 Construction and land development $ 294 $ 1,986 $ 548 $ 2,828 $ 581,612 $ 584,440 Commercial real estate: Nonfarm, nonresidential 515 — — 515 753,728 754,243 Other — — — — 48,017 48,017 Residential real estate: Closed-end 1-4 family 2,390 404 228 3,022 490,043 493,065 Other 142 — 1,810 1,952 187,865 189,817 Commercial and industrial 241 252 208 701 592,092 592,793 Consumer and other — — — — 5,568 5,568 $ 3,582 $ 2,642 $ 2,794 $ 9,018 $ 2,658,925 $ 2,667,943 Credit Quality Indicators: The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans as well as non-homogeneous residential real estate loans. This analysis is performed on a quarterly basis. The Company uses the following definitions for risk ratings: Special Mention. Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. Substandard. Loans classified as substandard 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 institution will sustain some loss if the deficiencies are not corrected. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass-rated loans. The following table excludes deferred loan fees and includes PCI loans, which are included in the “Substandard” column. Based on the most recent analysis performed, the risk category of loans by class of loans is as follows as of June 30, 2019 and December 31, 2018: Pass Special Mention Substandard Total June 30, 2019 Construction and land development $ 584,251 113 235 $ 584,599 Commercial real estate: Nonfarm, nonresidential 894,430 480 — 894,910 Other 37,229 616 — 37,845 Residential real estate: Closed-end 1-4 family 494,306 — 2,291 496,597 Other 195,207 — 2,342 197,549 Commercial and industrial 642,120 2,662 23,283 668,065 Consumer and other 4,945 — — 4,945 $ 2,852,488 $ 3,871 $ 28,151 $ 2,884,510 Pass Special Mention Substandard Total December 31, 2018 Construction and land development $ 580,468 $ 1,416 $ 2,556 $ 584,440 Commercial real estate: Nonfarm, nonresidential 739,469 14,774 — 754,243 Other 48,017 — — 48,017 Residential real estate: Closed-end 1-4 family 489,781 948 2,336 493,065 Other 186,485 404 2,928 189,817 Commercial and industrial 553,589 8,313 30,891 592,793 Consumer and other 5,567 1 — 5,568 $ 2,603,376 $ 25,856 $ 38,711 $ 2,667,943 Troubled Debt Restructurings As of June 30, 2019, the Company’s loan portfolio contains one loan that has been modified in a troubled debt restructuring with a balance of $316. As of December 31, 2018, the Company’s loan portfolio contained one loan that had been modified in a troubled debt restructuring with a balance of $167.

Loan Servicing

Loan Servicing	6 Months Ended
	Jun. 30, 2019
Transfers And Servicing [Abstract]
Loan Servicing	NOTE 4—LOAN SERVICING Loans serviced for others are not reported as assets. The principal balances of these loans at June 30, 2019 and December 31, 2018 are as follows: June 30, 2019 December 31, 2018 Loan portfolios serviced for: Federal Home Loan Mortgage Corporation $ 491,388 $ 492,761 Other 3,614 3,689 The related loan servicing rights activity for the three and six months ended June 30, 2019 and 2018 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Servicing rights: Beginning of period $ 3,366 $ 3,602 $ 3,403 $ 3,620 Additions 196 161 383 357 Amortized to expense (263 ) (227 ) (487 ) (441 ) Decrease in impairment — — — — End of period $ 3,299 $ 3,536 $ 3,299 $ 3,536 The components of net loan servicing fees for the three and six months ended June 30, 2019 and 2018 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Loan servicing fees, net: Loan servicing fees $ 312 $ 330 $ 618 $ 663 Amortization of loan servicing fees (263 ) (227 ) (487 ) (441 ) Total $ 49 $ 103 $ 131 $ 222 The fair value of servicing rights was estimated by management to be approximately $3,905 at June 30, 2019. Fair value for June 30, 2019 was determined using a weighted average discount rate of 9.5% and a weighted average prepayment speed of 16.4%. At December 31, 2018, the fair value of servicing rights was estimated by management to be approximately $4,836. Fair value for December 31, 2018 was determined using a weighted average discount rate of 9.5% and a weighted average prepayment speed of 11.9%.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	NOTE 5—LEASES A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. On January 1, 2019, the Company adopted ASU No. 2016-02 “Leases” (Topic 842) Lessee Accounting Substantially all of the leases in which the Company is the lessee are comprised of real estate property for branches and office space with terms extending through 2033. Substantially all of our leases are classified as operating leases, and therefore, were previously not recognized on the Company’s consolidated statements of condition. Upon adoption of FASB ASU 2016-02 Leases one additional lease agreement has been executed and is scheduled to commence in 2020 relocating one branch in Williamson County, Tennessee. The following table represents the consolidated statements of condition classification of the Company’s ROU assets and lease liabilities. The Company elected not to include short-term leases (i.e., leases with initial terms of twelve months or less), or equipment leases (deemed immaterial) on the consolidated statements of condition. Lease right-of-use assets Classification June 30, 2019 Operating lease right-of-use assets Other Assets $ 40,967 Finance lease right-of-use assets Other Assets 2,919 Total lease right-of-use assets $ 43,886 Lease liabilities Classification June 30, 2019 Operating lease right-of-use assets Other Liabilities $ 42,556 Finance lease right-of-use assets Other Liabilities 2,996 Total lease liabilities $ 45,552 The calculated amount of the ROU assets and lease liabilities in the table above are impacted by the length of the lease term and the discount rate used to present value the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion, which will be determined within the timeframe of the lease agreement, and not included within the calculated ROU. The Company utilizes the discount rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company calculated a blended rate consisting of the Federal Home Loan Bank’s rate matching to the duration of the lease (over-collateralized borrowing rate) and the offering rate of the Company’s most recent subordinated debt offering in June of 2016. For operating leases existing prior to January 1, 2019, the rate for the remaining lease term as of January 1, 2019, was used. For the Company’s only finance lease that commenced December 2018, the Company utilized its blended rate calculation based on the term of the lease. Weighted-average remaining lease term (in years) June 30, 2019 Operating leases 12.1 Finance lease 14.9 Weighted-average discount rate Operating leases 5.48% Finance lease 5.49% The following table represents lease costs and other lease information. As the Company elected, for all classes of underlying assets, not to separate lease and non-lease components and instead to account for them as a single lease component, the variable lease cost primarily represents variable payments such as common area maintenance and utilities. Lease costs Operating lease costs $ 2,527 Variable lease costs 181 Short-term lease costs 94 Finance lease costs Interest on lease liabilities ( 1) 82 Amortization of right-of-use asset 101 Total lease costs $ 2,985 (1) Included in interest expense on Federal Home Loan Advances and other borrowings in the Company's consolidated statement of income. All other lease costs in this table are included in occupancy and equipment expense. Rent expense related to leases during the three and six months ended June 30, 2018, was $1,319 and $2,547, respectively. Other supplemental cash flow information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 2,342 Operating cash flows from finance leases 82 Financing cash flows from finance leases 54 Future minimum payments for a finance lease and operating leases with initial or remaining terms of one year of more as of June 30, 2019 are as follows: Twelve Months Ended: Finance Operating 2020 $ 274 $ 4,812 2021 278 4,869 2022 282 4,876 2023 286 4,850 2024 291 4,921 Thereafter 2,986 33,713 Total future minimum lease payments $ 4,397 $ 58,041 Less: Imputed interest (1,401 ) (15,485 ) Total lease liabilities $ 2,996 $ 42,556 Future minimum payments for a finance lease and operating leases with initial or remaining terms of one year of more as of December 31, 2018 are as follows: Twelve Months Ended: Finance Operating 2019 $ 272 $ 4,841 2020 276 4,849 2021 280 4,871 2022 284 4,856 2023 288 4,885 Thereafter 3,133 36,178 Total future minimum lease payments $ 4,533 $ 60,480

Share-Based Payments

Share-Based Payments	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Share-Based Payments	NOTE 6—SHARE-BASED PAYMENTS The Company has two share based compensation plans as described below. Total compensation cost that has been charged against income for those plans was $1,513 and $1,318, and $2,842 and $2,078 for the three and six months ended June 30, 2019 and 2018, respectively. The total income tax benefit, which is shown on the Consolidated Statements of Income as a reduction of income tax expense, was $92 and $205 for the three and six months ended June 30, 2019 and was $220 and $283 for the three and six months ended June 30, 2018, respectively. Stock Options Employee, organizer and director stock option awards are generally granted with an exercise price equal to the market price of the Company’s common stock at the date of grant; those option awards have The fair value of each option award is estimated on the date of grant using a closed form option valuation (Black-Scholes) model that uses the assumptions noted in the table below. Expected stock price volatility is based on historical volatilities of the Company. The Company uses historical data to estimate option exercise and post-vesting termination behavior. The expected term of options granted represents the period of time that options granted are expected to be outstanding, which takes into account that the options are not transferable. The risk-free interest rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The fair value of options granted was determined using the following weighted-average assumptions as of grant date. June 30, 2019 June 30, 2018 Risk-free interest rate 2.47 % 2.96 % Expected term 7 years 7.5 years Expected stock price volatility 30.64 % 32.09 % Dividend yield 0.57 % 0.00 % The weighted average fair value of options granted for the six months ended June 30, 2019 and 2018 were $9.78 and $12.03, respectively. A summary of the activity in the plans for the six months ended June 30, 2019 follows: Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at December 31, 2018 1,807,922 $ 24.68 6.41 $ 9,581 Granted 91,823 27.83 Exercised (128,125 ) 14.14 Forfeited, expired, or cancelled (18,883 ) 32.74 Outstanding at period end 1,752,737 $ 18.47 6.87 $ 4,113 Vested or expected to vest 1,666,525 $ 25.52 6.13 $ 3,908 Exercisable at period end 839,675 $ 17.32 6.13 $ 8,847 For the Six Months Ended June 30, 2019 2018 Stock options exercised: Intrinsic value of options exercised $ 1,869 $ 3,745 Cash received from options exercised 1,277 1,937 Tax benefit realized from option exercises 205 283 As of June 30, 2019, there was $4,786 of total unrecognized compensation cost related to non-vested stock options granted under the plans. The cost is expected to be recognized over a weighted-average period of 1.97 years. Restricted Stock and Restricted Stock Units A summary of activity for non-vested restricted share awards for the six months ended June 30, 2019 is as follows: Non-vested Shares Shares Weighted- Average Grant- Date Fair Value Non-vested at December 31, 2018 176,516 $ 31.07 Granted 1,255 31.87 Vested (70,069 ) 30.33 Forfeited (1,035 ) 32.95 Non-vested at June 30, 2019 106,667 Compensation expense associated with the restricted share awards is recognized on a straight-line basis over the time period that the restrictions associated with the awards lapse based on the total cost of the award at the grant date. As of June 30, 2019, there was $1,713 of total unrecognized compensation cost related to non-vested shares granted under the 2007 Plan and Amended and Restated 2017 Plan. The cost is expected to be recognized over a weighted-average period of 1.30 years.

Regulatory Capital Matters

Regulatory Capital Matters	6 Months Ended
	Jun. 30, 2019
Regulatory Capital Requirements [Abstract]
Regulatory Capital Matters	NOTE 7—REGULATORY CAPITAL MATTERS Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. The final rules implementing Basel Committee on Banking Supervision’s capital guidelines for U.S. Banks (Basel III rules) became effective for the Company on January 1, 2016 with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in January 1, 2019. The Basel III rules additionally provide for countercyclical capital requirements so that the required amount of capital increases in times of economic expansion and decreases in times of economic contraction, consistent with safety and soundness. Under the Basel III rules, banks must maintain a capital conservation buffer consisting of additional Common Equity Tier 1 Capital equal to 2.5% of risk-weighted assets above each of the required minimum capital levels in order to avoid limitations on paying dividends, engaging in share repurchases, and paying certain discretionary bonuses. This new capital conservation buffer requirement was phased in beginning January 2016 at 0.625% of risk-weighted assets and increased each year until fully implemented at 2.5% in January 2019. Prompt corrective action regulations provide five classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. At June 30, 2019, the most recent regulatory notifications categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. Management believes that, as of June 30, 2019, the Company and Bank met all capital adequacy requirements to which they are subject. There are no conditions or events since that notification that management believes have changed the institution’s category. Actual and required capital amounts and ratios are presented below as of June 30, 2019 and December 31, 2018 for the Company and Bank: Actual Required For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Regulations Amount Ratio Amount Ratio Amount Ratio June 30, 2019 Company-Level Company common equity Tier 1 capital to RWA $ 375,710 11.2 % $ 151,266 4.5 % N/A N/A Company Total Capital to RWA $ 462,020 13.7 % $ 268,918 8.0 % N/A N/A Company Tier 1 (Core) Capital to RWA $ 375,710 11.2 % $ 201,689 6.0 % N/A N/A Company Tier 1 (Core) Capital to average assets $ 375,710 9.2 % $ 134,459 4.0 % N/A N/A Bank-Level Bank common equity Tier 1 capital to RWA $ 433,574 12.9 % $ 151,253 4.5 % $ 218,476 6.5 % Bank Total Capital to RWA $ 461,102 13.7 % $ 268,894 8.0 % $ 336,117 10.0 % Bank Tier 1 (Core) Capital to RWA $ 433,574 12.9 % $ 201,670 6.0 % $ 268,894 8.0 % Bank Tier 1 (Core) Capital to average assets $ 433,574 10.6 % $ 163,420 4.0 % $ 204,274 5.0 % December 31, 2018 Company-Level Company common equity Tier 1 capital to RWA $ 367,096 12.2 % $ 135,598 4.5 % N/A N/A Company Total Capital to RWA $ 449,325 14.9 % $ 241,064 8.0 % N/A N/A Company Tier 1 (Core) Capital to RWA $ 367,096 12.2 % $ 180,798 6.0 % N/A N/A Company Tier 1 (Core) Capital to average assets $ 367,096 8.8 % $ 167,553 4.0 % N/A N/A Bank-Level Bank common equity Tier 1 capital to RWA $ 421,335 14.0 % $ 135,613 4.5 % $ 195,886 6.5 % Bank Total Capital to RWA $ 444,871 14.8 % $ 241,090 8.0 % $ 301,363 10.0 % Bank Tier 1 (Core) Capital to RWA $ 421,335 14.0 % $ 180,818 6.0 % $ 241,090 8.0 % Bank Tier 1 (Core) Capital to average assets $ 421,335 10.1 % $ 167,420 4.0 % $ 209,275 5.0 % Note: Minimum ratios presented exclude the capital conservation buffer Dividend Restrictions

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments	NOTE 8—DERIVATIVE INSTRUMENTS Financial derivatives are reported at fair value in other assets or other liabilities. The accounting for changes in the fair value of a derivative depends on whether it has been designated and qualifies as part of a hedging relationship. For derivatives not designated as hedges, the gain or loss is recognized in current earnings. Derivatives designated as fair value hedges For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged asset or liability attributable to the hedged risk are recognized in current earnings. The gain or loss on the derivative instrument is presented on the same income statement line item as the earnings effect of the hedged item. The Company utilizes interest rate swaps designated as fair value hedges to mitigate the effect of changing interest rates on the fair values of fixed rate callable securities available-for-sale. The hedging strategy on securities converts the fixed interest rates to LIBOR-based variable interest rates. These derivatives are designated as partial term hedges of selected cash flows covering specified periods of time prior to the call dates of the hedged securities. During A summary of the Company's fair value hedge relationships as of June 30, 2019 are as follows (in thousands): June 30, 2019 Balance Sheet Location Weighted Average Remaining Maturity (In Years) Weighted Average Pay Rate Receive Rate Notional Amount Estimated Fair Value Liability derivative Interest rate swap agreements - securities Other liabilities 7.23 2.527% 3 month LIBOR $ 101,205 $ 4,733 There were no fair value hedge relationships as of December 31, 2018. The effects of fair value hedge relationships reported in interest income on securities on the consolidated statements of income for the three and six months ended June 30, 2019 and 2018 were as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Gain (loss) on fair value hedging relationship 2019 2018 2019 2018 Interest rate swap agreements - securities: Hedged items $ 3,615 $ — $ 4,733 $ — Derivative designated as hedging instruments (3,615 ) — (4,733 ) — The following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges at June 30, 2019: Carrying Amount of the Hedged Assets (in thousands) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets Line item on the balance sheet June 30, 2019 June 30, 2019 Securities available-for-sale $ 101,205 $ 4,733 Derivatives designated as cash flow hedges For derivative instruments that are designated and qualify as a cash flow hedge, the aggregate fair value of the derivative instrument is recorded in other assets or other liabilities with any gain or loss related to changes in fair value recorded in accumulated other comprehensive income, net of tax. The gain or loss is reclassified into earnings in the same period during which the hedged asset or liability affects earnings and is presented in the same income statement line item as the earnings effect of the hedged asset or liability. The Company uses cash flow hedge relationships in an effort to manage future interest rate exposure. The hedging strategy converts the LIBOR-based variable interest rate on forecasted borrowings to a fixed interest rate and is used in an effort to protect the Company from floating interest rate variability. A summary of the Company's cash flow hedge relationships as of June 30, 2019 are as follows (in thousands): June 30, 2019 Balance Sheet Location Weighted Average Remaining Maturity (In Years) Weighted Average Pay Rate Receive Rate Notional Amount Estimated Fair Value Liability derivatives Interest rate swap agreements Other liabilities 2 2.232% 3 month LIBOR $ 100,000 $ 1,667 There were no cash flow hedge relationships as of December 31, 2018. The effects of the Company's cash flow hedge relationships on the statement of comprehensive income (loss) during the three and six months ended June 30, 2019 and 2018 were as follows: Amount of Gain Recognized in Other Comprehensive Income (Loss) Amount of Gain Recognized in Other Comprehensive Income (Loss) Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Liability derivatives Interest rate swap agreements $ (1,231 ) $ — $ (1,231 ) $ — The cash flow hedges were determined to be highly effective during the periods presented and as a result qualify for hedge accounting treatment. The Company expects the hedges to continue to be highly effective and qualify for hedge accounting during the remaining terms of the swaps.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 9—COMMITMENTS AND CONTINGENCIES We Those agreements involve, to varying degrees, elements of credit risk in excess of the amount recognized in the balance sheet. Commitments to make loans, credit lines and standby letters of credit involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the balance sheet. Off-balance-sheet risk to credit loss exists up to the face amount of these instruments, although material losses are not anticipated. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet financial instruments. The contractual amounts of financial instruments with off-balance sheet risk were as follows: June 30, 2019 December 31, 2018 Unused lines of credit $ 801,049 $ 654,584 Standby letters of credit 52,064 40,024 Unfunded loan commitments 63,707 28,731

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value	NOTE 10—FAIR VALUE 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. There are three levels of inputs that may be used to measure fair values: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Securities Other Assets Impaired Loans Foreclosed Assets Appraisals for both collateral-dependent impaired loans and real estate owned 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 credit administration 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. On an annual basis, the Company compares the actual selling price of collateral that has been sold to the most recent appraised value to determine what additional adjustment should be made to the appraisal value to arrive at fair value. Loans Held For Sale Other Liabilities Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which the Company has elected the fair value option, are summarized below: Fair Value Measurements at June 30, 2019 Using: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets Securities available for sale U.S. government sponsored entities and agencies $ — 1,688 $ — Mortgage-backed securities-residential — 474,051 — Mortgage-backed securities-commercial — 18,699 — Asset-backed securities — 25,208 — Corporate notes — 22,716 — State and political subdivisions — 172,770 — Total securities available for sale $ — $ 715,132 $ — Loans held for sale $ — $ 27,093 $ — Other assets $ — $ 278 $ — Financial Liabilities Other liabilities $ — $ 6,580 $ — Fair Value Measurements at December 31, 2018 Using: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets Securities available for sale U.S. Treasury securities $ 253,014 $ — $ — U.S. government sponsored entities and agencies — 21,888 — Mortgage-backed securities-residential — 580,699 — Asset-backed securities — 24,844 — Corporate notes 12,424 State and political subdivisions — 137,799 — Total securities available for sale $ 253,014 $ 777,654 $ — Loans held for sale $ — $ 11,103 $ — Other assets $ — $ 206 $ — Financial Liabilities Other liabilities $ — $ 129 $ — As of June 30, 2019, the unpaid principal balance of loans held for sale was $26,118 resulting in an unrealized gain of $975 included in mortgage banking revenue. As of December 31, 2018, the unpaid principal balance of loans held for sale was $10,722, resulting in an unrealized gain of $381 included in mortgage banking revenue. For the three months ended June 30, 2019 and 2018, the change in fair value related to loans held for sale, which is included in mortgage banking revenue, was $324 and $220, respectively. For the six months ended June 30, 2019 and 2018, the change in fair value related to loans held for sale, which is included in mortgage banking revenue, was $594 and $194, respectively. None of these loans were 90 days or more past due or on nonaccrual as of June 30, 2019 and December 31, 2018. There were no transfers between Level 1 and 2 during 2019 or 2018. Assets measured at fair value on a non-recurring basis are summarized below: There was one collateral-dependent impaired loan carried at fair value of $0 as of June 30, 2019. For the three and six months ended June 30, 2019, an additional provision for loan losses of $6,304 and $9,759 was recorded related to impaired loans recorded at fair value of collateral. There was one collateral-dependent impaired loan carried at fair value of $150 as of December 31, 2018. For the three and six months ended June 30, 2018, an additional provision for loan losses of $16 was recorded related to impaired loans recorded at fair value of collateral. Foreclosed assets measured at fair value less costs to sell, had a net carrying amount of $0 as of June 30, 2019 and December 31, 2018. There were no properties at June 30, 2019 or 2018 that had required write-downs to fair value. The carrying amounts and estimated fair values of financial instruments at June 30, 2019 and December 31, 2018 are as follows: Fair Value Measurements at June 30, 2019 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 150,721 $ 150,721 $ — $ — $ 150,721 Certificates of deposit held at other financial institutions 3,840 — 3,840 — 3,840 Securities available for sale 715,132 — 715,132 — 715,132 Securities held to maturity 118,963 — 120,809 — 120,809 Loans held for sale 27,093 — 27,093 — 27,093 Net loans 2,852,990 — — 2,886,557 2,886,557 Servicing rights, net 3,299 — — 3,905 3,905 Other assets 278 — 278 — 278 Accrued interest receivable 14,281 136 5,196 8,950 14,282 Financial liabilities Deposits $ 3,146,645 $ 2,182,888 $ 965,228 $ — $ 3,148,116 Federal Home Loan Bank advances 396,500 — 396,624 — 396,624 Subordinated notes, net 58,782 — — 61,438 61,438 Other liabilities 6,580 — 6,580 — 6,580 Accrued interest payable 4,312 179 687 3,446 4,312 Fair Value Measurements at December 31, 2018 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 280,212 $ 280,212 $ — $ — $ 280,212 Certificates of deposit held at other financial institutions 3,594 — 3,594 — 3,594 Securities available for sale 1,030,668 253,014 777,654 — 1,030,668 Securities held to maturity 121,617 — 118,955 — 118,955 Loans held for sale 11,103 — 11,103 — 11,103 Net loans 2,641,948 — — 2,622,386 2,622,386 Servicing rights, net 3,403 — — 4,836 4,836 Other assets 206 — 206 — 206 Accrued interest receivable 13,337 71 5,539 7,727 13,337 Financial liabilities Deposits $ 3,431,807 $ 2,105,951 $ 1,319,326 $ — $ 3,425,277 Federal Home Loan Bank advances 368,500 — 366,786 — 366,786 Subordinated notes, net 58,693 — — 59,852 59,852 Other liabilities 129 — 129 — 129 Accrued interest payable 4,700 146 3,866 688 4,700 The methods and assumptions not previously described used to estimate fair values are described as follows: (a) Cash and Cash Equivalents: The carrying amounts of cash and short-term instruments approximate fair values and are classified as Level 1. (b) Loans: Fair values of loans, excluding loans held for sale, are estimated as follows: In accordance with ASU 2016-01, the fair value of loans held for investment, excluding previously presented impaired loans measured at fair value on a non-recurring basis, is estimated using a cash flow projection methodology that relies on three primary assumptions: (1) the expected prepayment rate of loans; (2) the magnitude of future net losses based on expected default rate and severity of loss; and (3) the discount rate applicable to the expected cash flows of the loan portfolio. Loans are considered a Level 3 classification. (c) Mortgage Servicing Rights: Fair value of mortgage servicing rights is based on valuation models that calculate the present value of estimated net cash flows based on industry market data. The valuation model incorporates assumptions that market participants would use in estimating future net cash flows resulting in a Level 3 classification. (d) Deposits: The fair values disclosed for demand deposits (e.g., interest and non-interest checking, passbook savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amount) resulting in a Level 1 classification. The carrying amounts of fixed-term money market accounts approximate their fair values at the reporting date resulting in a Level 1 classification. Fair values for certificates of deposit are estimated using a discounted cash flows calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits resulting in a Level 2 classification. (e) Federal Funds Purchased and Repurchase Agreements: The carrying amounts of federal funds purchased, borrowings under repurchase agreements, and other short-term borrowings, generally maturing within ninety days, approximate their fair values resulting in a Level 2 classification. (f) Federal Home Loan Bank Advances: The fair values of the Company’s long-term borrowings are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 2 classification. (g) Subordinated Notes: The fair values of the Company’s subordinated notes are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 3 classification. (h) Accrued Interest Receivable/Payable: The carrying amounts of accrued interest approximate fair value resulting in a Level 1, Level 2 or Level 3 classification based on the asset/liability with which they are associated. (i) Off-balance Sheet Instruments: Fair values for off-balance sheet, credit-related financial instruments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The fair value of commitments is not material.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 11—EARNINGS PER SHARE The two-class method is used in the calculation of basic and diluted earnings per share. Under the two-class method, earnings available to common shareholders for the period are allocated between common shareholders and participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings. The factors used in the earnings per share computation follow: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Basic Net income available to common shareholders $ 5,173 $ 10,161 $ 8,075 $ 20,213 Less: earnings allocated to participating securities (41 ) (118 ) (79 ) (192 ) Net income allocated to common shareholders $ 5,132 $ 10,043 $ 7,996 $ 20,021 Weighted average common shares outstanding including participating securities 14,599,407 14,383,493 14,580,370 13,819,742 Less: Participating securities (117,063 ) (167,381 ) (143,043 ) (130,898 ) Average shares 14,482,344 14,216,112 14,437,327 13,688,844 Basic earnings per common share $ 0.35 $ 0.71 $ 0.55 $ 1.46 Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Diluted Net income allocated to common shareholders $ 5,132 $ 10,043 $ 7,996 $ 20,021 Weighted average common shares outstanding for basic earnings per common share 14,482,344 14,216,112 14,437,327 13,688,844 Add: Dilutive effects of assumed exercises of stock options 341,777 597,947 376,762 557,307 Add: Dilutive effects of assumed restricted stock units 70,019 — 35,203 — Average shares and dilutive potential common shares 14,894,140 14,814,059 14,849,292 14,246,151 Dilutive earnings per common share $ 0.34 $ 0.68 $ 0.54 $ 1.41 For three months ended June 30, 2019 and 2018, stock options for 980,099 and 659,291 shares of common stock, respectively, were not considered in computing diluted earnings per common share because they were antidilutive. Stock options for 874,279 and 535,285 shares of common stock were not considered in computing diluted earnings per common share for the six months ended June 30, 2019 and 2018, respectively, because they were antidilutive.

Subordinated Debt Issuance

Subordinated Debt Issuance	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Subordinated Debt Issuance	NOTE 12—SUBORDINATED DEBT ISSUANCE The Company’s subordinated notes, net of issuance costs, totaled $58,782 and $58,693 at June 30, 2019 and at December 31, 2018, respectively. For regulatory capital purposes, the subordinated notes are treated as Tier 2 capital, subject to certain limitations, and are included in total regulatory capital when calculating the Company’s total capital to risk weighted assets ratio as indicated in Note 7 of these consolidated financial statements. The Company completed the issuance of $60,000 in principal amount of subordinated notes in two separate offerings. In March 2016, $40,000 of 6.875% fixed-to-floating rate subordinated notes (the “March 2016 Subordinated Notes”) were issued in a public offering to accredited institutional investors, and in June 2016, $20,000 of 7.00% fixed-to-floating rate subordinated notes (the “June 2016 Subordinated Notes”) were issued to certain accredited institutional investors in a private offering. The subordinated notes are unsecured and will rank at least equally with all of the Company’s other unsecured subordinated indebtedness and will be effectively subordinated to all of our secured debt to the extent of the value of the collateral securing such debt. The subordinated notes will be subordinated in right of payment to all of our existing and future senior indebtedness, and will rank structurally junior to all existing and future liabilities of our subsidiaries including, in the case of the Company’s bank subsidiary, its depositors, and any preferred equity holders of our subsidiaries. The holders of the subordinated notes may be fully subordinated to interests held by the U.S. government in the event that we enter into a receivership, insolvency, liquidation, or similar proceeding. The issuance costs related to the March 2016 Subordinated Notes amounted to $1,382 and are being amortized as interest expense over the ten-year term of the March 2016 Subordinated Notes. The issuance costs related to the June 2016 Subordinated Notes were $404 and are being amortized as interest expense over the ten-year term of the June 2016 Subordinated Notes. For the six months ended June 30, 2019 and 2018, amortization of issuance costs remained consistent at $89. The following table summarizes the terms of each subordinated note offering: March 2016 Subordinated Notes June 2016 Subordinated Notes Principal amount issued $40,000 $20,000 Maturity date March 30, 2026 July 1, 2026 Initial fixed interest rate 6.875% 7.00% Initial interest rate period 5 years 5 years First interest rate change date March 30, 2021 July 1, 2021 Interest payment frequency through year five* Semiannually Semiannually Interest payment frequency after five years* Quarterly Quarterly Interest repricing index and margin 3-month LIBOR plus 5.636% 3-month LIBOR plus 6.04% Repricing frequency after five years Quarterly Quarterly

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, Leases The guidance requires that a lessee should now recognize lease assets and lease liabilities for operating leases. In July 2016, the FASB issued Accounting Standards Update 2018-10, Codification Improvements to Topic 842, Leases Accounting Standards Update 2018-11, Leases (Topic 842): Targeted Improvements In March 2019, the FASB issued ASU No. 2019-01, “Leases: Codification Improvements” which addresses lessors and clarifies the transition guidance related to certain interim disclosures provided in the year of adoption. right of use asset and lease liability of $43,723. See Note 5 - Leases for more information. In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities In October 2018, the FASB issued ASU 2018-16, “Derivatives and Hedging (Topic 815) - Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes.”
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In June 2016, FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ASU 2016-13 ASU No. 2018-19 Codification Improvements to Topic 326 Financial Instruments—Credit Losses ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, and ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326) Targeted Transition Relief . In January 2017, the FASB issued ASU 2017-04, “ Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In August 2018, the FASB issued ASU No. 2018-13, “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” In August 2018, the FASB issued ASU 2018-15, “ Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract .” ASU 2018-15 clarifies certain aspects of ASU 2015-05, “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement,” which was issued in April 2015. Specifically, ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). ASU 2018-15 does not affect the accounting for the service element of a hosting arrangement that is a service contract. ASU 2018-15 will be effective for the Company on January 1, 2020, with early adoption permitted, and is not expected to have a significant impact on our financial statements.
Leases	A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. On January 1, 2019, the Company adopted ASU No. 2016-02 “Leases” (Topic 842)

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost and Fair Value of Available for Sale Securities	The following table summarizes the amortized cost and fair value of the securities available for sale portfolio at June 30, 2019 and December 31, 2018 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value June 30, 2019 U.S. government sponsored entities and agencies $ 1,695 1 (8 ) $ 1,688 Mortgage-backed securities: residential 476,378 1,417 (3,744 ) 474,051 Mortgage-backed securities: commercial 18,544 275 (120 ) 18,699 Asset-backed securities 25,746 27 (565 ) 25,208 Corporate notes 22,360 356 — 22,716 State and political subdivisions 172,585 279 (94 ) 172,770 Total $ 717,308 $ 2,355 $ (4,531 ) $ 715,132 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2018 U.S. Treasury securities $ 253,015 $ 59 $ (60 ) $ 253,014 U.S. government sponsored entities and agencies 21,999 1 (112 ) 21,888 Mortgage-backed securities: residential 596,766 27 (16,094 ) 580,699 Asset-backed securities 25,744 — (900 ) 24,844 Corporate notes 12,480 21 (77 ) 12,424 State and political subdivisions 141,432 863 (4,496 ) 137,799 Total $ 1,051,436 $ 971 $ (21,739 ) $ 1,030,668
Schedule of Amortized Cost and Fair Value of Held to Maturity Securities Portfolio	The amortized cost and fair value of the securities held to maturity portfolio at June 30, 2019 and December 31, 2018 and the corresponding amounts of gross unrecognized gains and losses were as follows: Amortized Cost Gross Unrecognized Gains Gross Unrecognized Losses Fair Value June 30, 2019 Mortgage backed securities: residential $ 74,163 $ 198 $ (1,029 ) $ 73,332 State and political subdivisions 44,800 2,677 — 47,477 Total $ 118,963 $ 2,875 $ (1,029 ) $ 120,809 December 31, 2018 Mortgage backed securities: residential $ 75,944 $ 34 $ (3,072 ) $ 72,906 State and political subdivisions 45,673 466 (90 ) 46,049 Total $ 121,617 $ 500 $ (3,162 ) $ 118,955
Summary of Proceeds from Sales and Calls of Securities Available for Sale and Associated Gains and Losses	The proceeds from sales and calls of securities available for sale and the associated gains and losses were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Proceeds $ 87,424 $ 1 $ 347,037 $ 1 Gross gains 367 1 2,168 1 Gross losses — — (1,651 ) —
Schedule of Amortized Cost and Fair Value of Investment Securities Portfolio by Contractual Maturity	The amortized cost and fair value of the investment securities portfolio are shown by contractual maturity. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. June 30, 2019 Amortized Cost Fair Value Available for sale One year or less $ 10,502 $ 10,498 Over one year through five years 697 697 Over five years through ten years 27,586 28,033 Over ten years 157,855 157,946 Asset-backed securities 25,746 25,208 Mortgage-backed securities: residential 476,378 474,051 Mortgage-backed securities: commercial 18,544 18,699 Total $ 717,308 $ 715,132 Held to maturity Over one year through five years 1,106 1,138 Over five years through ten years 1,034 1,076 Over ten years 42,660 45,263 Mortgage-backed securities: residential 74,163 73,332 Total $ 118,963 $ 120,809
Schedule of Unrealized Losses and Fair Value by Major Security Type	The following table summarizes the securities with unrealized and unrecognized losses at June 30, 2019 and December 31, 2018, aggregated by major security type and length of time in a continuous unrealized loss position: Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses June 30, 2019 Available for sale U.S. government sponsored entities and agencies $ 48 $ — $ 483 $ (8 ) $ 531 $ (8 ) Mortgage-backed securities: residential 8,385 (44 ) 329,225 (3,700 ) 337,610 (3,744 ) Mortgage-backed securities: commercial — — 7,532 (120 ) 7,532 (120 ) Asset-backed securities 22,713 (565 ) — — 22,713 (565 ) State and political subdivisions 9,996 (4 ) 30,152 (90 ) 40,148 (94 ) Total available for sale $ 41,142 $ (613 ) $ 367,392 $ (3,918 ) $ 408,534 $ (4,531 ) Less Than 12 Months 12 Months or Longer Total Fair Value Unrecognized Losses Fair Value Unrecognized Losses Fair Value Unrecognized Losses Held to maturity Mortgage-backed securities: residential $ 1,639 $ (6 ) $ 59,548 $ (1,023 ) $ 61,187 $ (1,029 ) Total held to maturity $ 1,639 $ (6 ) $ 59,548 $ (1,023 ) $ 61,187 $ (1,029 ) Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2018 Available for sale U.S. Treasury securities $ 163,722 $ (60 ) $ — $ — $ 163,722 $ (60 ) U.S. government sponsored entities and agencies 1,355 (12 ) 19,937 (100 ) 21,292 (112 ) Mortgage-backed securities: residential 83,203 (755 ) 490,752 (15,339 ) 573,955 (16,094 ) Asset-backed securities 24,845 (900 ) — — 24,845 (900 ) Corporate 9,839 (77 ) — — 9,839 (77 ) State and political subdivisions 10,446 (106 ) 69,238 (4,390 ) 79,684 (4,496 ) Total available for sale $ 293,410 $ (1,910 ) $ 579,927 $ (19,829 ) $ 873,337 $ (21,739 ) Less Than 12 Months 12 Months or Longer Total Fair Value Unrecognized Losses Fair Value Unrecognized Losses Fair Value Unrecognized Losses Held to maturity Mortgage-backed securities: residential $ 2,239 $ (40 ) $ 68,067 $ (3,032 ) $ 70,306 $ (3,072 ) State and political subdivisions 8,362 (39 ) 3,675 (51 ) 12,037 (90 ) Total held to maturity $ 10,601 $ (79 ) $ 71,742 $ (3,083 ) $ 82,343 $ (3,162 )

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Summary of Loans	Loans at June 30, 2019 and December 31, 2018 were as follows: June 30, 2019 December 31, 2018 Loans Construction and land development $ 584,599 $ 584,440 Commercial real estate: Nonfarm, nonresidential 894,910 754,243 Other 37,845 48,017 Residential real estate: Closed-end 1-4 family 496,597 493,065 Other 197,549 189,817 Commercial and industrial 668,065 592,793 Consumer and other 4,945 5,568 Loans before net deferred loan fees 2,884,510 2,667,943 Deferred loan fees, net (4,077 ) (2,544 ) Total loans 2,880,433 2,665,399 Allowance for loan losses (27,443 ) (23,451 ) Total loans, net of allowance for loan losses $ 2,852,990 $ 2,641,948
Activity in Allowance for Loan Losses by Portfolio Segment	The following table presents the activity in the allowance for loan losses by portfolio segment for the three-month periods ended June 30, 2019 and 2018: Construction and Land Development Commercial Real Estate Residential Real Estate Commercial and Industrial Consumer and Other Total Three Months Ended June 30, 2019 Allowance for loan losses: Beginning balance $ 4,742 $ 7,027 $ 4,810 $ 11,229 $ 49 $ 27,857 Provision for loan losses 42 614 18 6,382 (25 ) 7,031 Loans charged-off — — — (7,563 ) (29 ) (7,592 ) Recoveries — — 16 70 61 147 Total ending allowance balance $ 4,784 $ 7,641 $ 4,844 $ 10,118 $ 56 $ 27,443 Three Months Ended June 30, 2018 Allowance for loan losses: Beginning balance $ 4,345 $ 5,875 $ 3,605 $ 7,866 $ 47 $ 21,738 Provision for loan losses 267 288 909 (900 ) 6 570 Loans charged-off — — — — (5 ) (5 ) Recoveries 1 — 19 10 8 38 Total ending allowance balance $ 4,613 $ 6,163 $ 4,533 $ 6,976 $ 56 $ 22,341 The following table presents the activity in the allowance for loan losses by portfolio segment for the six-month periods ended June 30, 2019 and 2018. Construction and Land Development Commercial Real Estate Residential Real Estate Commercial and Industrial Consumer and Other Total Six Months Ended June 30, 2019 Allowance for loan losses: Beginning balance $ 4,743 $ 6,725 $ 4,743 $ 7,166 $ 74 $ 23,451 Provision for loan losses 41 916 101 11,012 16 12,086 Loans charged-off — — (15 ) (8,131 ) (99 ) (8,245 ) Recoveries — — 15 71 65 151 Total ending allowance balance $ 4,784 $ 7,641 $ 4,844 $ 10,118 $ 56 $ 27,443 Six Months Ended June 30, 2018 Allowance for loan losses: Beginning balance $ 3,802 $ 5,981 $ 3,834 $ 7,587 $ 43 $ 21,247 Provision for loan losses 848 182 668 (572 ) 17 1,143 Loans charged-off (38 ) — (7 ) (49 ) (17 ) (111 ) Recoveries 1 — 38 10 13 62 Total ending allowance balance $ 4,613 $ 6,163 $ 4,533 $ 6,976 $ 56 $ 22,341
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method	The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of June 30, 2019 and December 31, 2018. For purposes of this disclosure, recorded investment in loans excludes accrued interest receivable and net deferred loan fees due to immateriality. Construction and Land Development Commercial Real Estate Residential Real Estate Commercial and Industrial Consumer and Other Total June 30, 2019 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 2,193 $ — $ 2,193 Collectively evaluated for impairment 4,784 7,641 4,844 7,925 56 25,250 Total ending allowance balance $ 4,784 $ 7,641 $ 4,844 $ 10,118 $ 56 $ 27,443 Loans: Individually evaluated for impairment $ — $ — $ 1,837 $ 2,193 $ — $ 4,030 Collectively evaluated for impairment 584,599 932,755 692,309 665,872 4,945 2,880,480 Total ending loans balance $ 584,599 $ 932,755 $ 694,146 $ 668,065 $ 4,945 $ 2,884,510 December 31, 2018 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 17 $ — $ 17 Collectively evaluated for impairment 4,743 6,725 4,743 7,149 74 23,434 Total ending allowance balance $ 4,743 $ 6,725 $ 4,743 $ 7,166 $ 74 $ 23,451 Loans: Individually evaluated for impairment $ 2,298 $ — $ 3,189 $ 167 $ — $ 5,654 Collectively evaluated for impairment 582,142 802,260 679,693 592,626 5,568 2,662,289 Total ending loans balance $ 584,440 $ 802,260 $ 682,882 $ 592,793 $ 5,568 $ 2,667,943
Summary of Impaired Loans by Class of Loans	The following table presents information related to impaired loans by class of loans as of June 30, 2019 and December 31, 2018: Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated June 30, 2019 With no allowance recorded: Residential real estate: Closed-end 1-4 family $ 491 484 $ — Other 1,353 1,353 — Commercial and industrial — — — Subtotal 1,844 1,837 — With an allowance recorded: Commercial and industrial 5,722 2,193 2,193 Subtotal 5,722 2,193 2,193 Total $ 7,566 $ 4,030 $ 2,193 December 31, 2018 With no allowance recorded: Construction and land development $ 2,298 $ 2,298 $ — Residential real estate: Closed-end 1-4 family 1,280 1,272 — Other 1,917 1,917 — Subtotal 5,495 5,487 — With an allowance recorded: Commercial and industrial 167 167 17 Subtotal 167 167 17 Total $ 5,662 $ 5,654 $ 17 The following table presents the average recorded investment of impaired loans by class of loans for the three and six months ended June 30, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, Average Recorded Investment 2019 2018 2019 2018 With no allowance recorded: Construction and land development $ — $ — $ 384 $ 100 Commercial real estate: Nonfarm, nonresidential — — 25 — Residential real estate: Closed-end 1-4 family 681 496 744 432 Other 1,086 112 1,174 192 Commercial and industrial 2,638 883 1,319 867 Subtotal 4,405 1,491 3,646 1,591 With an allowance recorded: Construction and land development $ — $ — $ 91 $ — Commercial and industrial 4,404 1,638 3,787 1,785 Subtotal 4,404 1,638 3,878 1,785 Total average recorded investment $ 8,809 $ 3,129 $ 7,524 $ 3,376
Schedule of Recorded Investment in Nonaccrual and Loans Past Due Over 90 Days on Accrual by Class of Loans	The following table presents the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans as of June 30, 2019 and December 31, 2018: Nonaccrual Loans Past Due Over 90 Days And Still Accruing Interest June 30, 2019 Residential real estate: Closed-end 1-4 family $ 484 $ — Other 1,353 250 Commercial and industrial 2,193 426 Total $ 4,030 $ 676 December 31, 2018 Construction and land development $ 2,298 $ — Residential real estate: Closed-end 1-4 family 1,273 — Other 1,917 — Commercial and industrial — 208 Total $ 5,488 $ 208
Schedule of Aging of Recorded Investment in Past Due Loans by Class of Loans	The following table presents the aging of the recorded investment in past due loans as of June 30, 2019 and December 31, 2018 by class of loans: 30-59 Days Past Due 60-89 Days Past Due Greater Than 89 Days Past Due Total Past Due Loans Not Past Due Total June 30, 2019 Construction and land development $ — $ 380 $ — $ 380 $ 584,219 $ 584,599 Commercial real estate: Nonfarm, nonresidential — — — — 894,910 894,910 Other — — — — 37,845 37,845 Residential real estate: Closed-end 1-4 family 350 — 159 509 496,088 496,597 Other 218 404 609 1,231 196,318 197,549 Commercial and industrial 601 289 2,619 3,509 664,556 668,065 Consumer and other 33 — — 33 4,912 4,945 $ 1,202 $ 1,073 $ 3,387 $ 5,662 $ 2,878,848 $ 2,884,510 December 31, 2018 Construction and land development $ 294 $ 1,986 $ 548 $ 2,828 $ 581,612 $ 584,440 Commercial real estate: Nonfarm, nonresidential 515 — — 515 753,728 754,243 Other — — — — 48,017 48,017 Residential real estate: Closed-end 1-4 family 2,390 404 228 3,022 490,043 493,065 Other 142 — 1,810 1,952 187,865 189,817 Commercial and industrial 241 252 208 701 592,092 592,793 Consumer and other — — — — 5,568 5,568 $ 3,582 $ 2,642 $ 2,794 $ 9,018 $ 2,658,925 $ 2,667,943
Summary of Risk Category of Loans by Class of Loans	Based on the most recent analysis performed, the risk category of loans by class of loans is as follows as of June 30, 2019 and December 31, 2018: Pass Special Mention Substandard Total June 30, 2019 Construction and land development $ 584,251 113 235 $ 584,599 Commercial real estate: Nonfarm, nonresidential 894,430 480 — 894,910 Other 37,229 616 — 37,845 Residential real estate: Closed-end 1-4 family 494,306 — 2,291 496,597 Other 195,207 — 2,342 197,549 Commercial and industrial 642,120 2,662 23,283 668,065 Consumer and other 4,945 — — 4,945 $ 2,852,488 $ 3,871 $ 28,151 $ 2,884,510 Pass Special Mention Substandard Total December 31, 2018 Construction and land development $ 580,468 $ 1,416 $ 2,556 $ 584,440 Commercial real estate: Nonfarm, nonresidential 739,469 14,774 — 754,243 Other 48,017 — — 48,017 Residential real estate: Closed-end 1-4 family 489,781 948 2,336 493,065 Other 186,485 404 2,928 189,817 Commercial and industrial 553,589 8,313 30,891 592,793 Consumer and other 5,567 1 — 5,568 $ 2,603,376 $ 25,856 $ 38,711 $ 2,667,943

Loan Servicing (Tables)

Loan Servicing (Tables)	6 Months Ended
	Jun. 30, 2019
Transfers And Servicing [Abstract]
Schedule of Loans Serviced Not Reported as Assets	Loans serviced for others are not reported as assets. The principal balances of these loans at June 30, 2019 and December 31, 2018 are as follows: June 30, 2019 December 31, 2018 Loan portfolios serviced for: Federal Home Loan Mortgage Corporation $ 491,388 $ 492,761 Other 3,614 3,689
Related Loan Servicing Rights Activity	The related loan servicing rights activity for the three and six months ended June 30, 2019 and 2018 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Servicing rights: Beginning of period $ 3,366 $ 3,602 $ 3,403 $ 3,620 Additions 196 161 383 357 Amortized to expense (263 ) (227 ) (487 ) (441 ) Decrease in impairment — — — — End of period $ 3,299 $ 3,536 $ 3,299 $ 3,536
Components of Net Loan Servicing Fees	The components of net loan servicing fees for the three and six months ended June 30, 2019 and 2018 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Loan servicing fees, net: Loan servicing fees $ 312 $ 330 $ 618 $ 663 Amortization of loan servicing fees (263 ) (227 ) (487 ) (441 ) Total $ 49 $ 103 $ 131 $ 222

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Summary of Consolidated Statements of Condition Classification of ROU Assets And Lease Liabilities	The following table represents the consolidated statements of condition classification of the Company’s ROU assets and lease liabilities. The Company elected not to include short-term leases (i.e., leases with initial terms of twelve months or less), or equipment leases (deemed immaterial) on the consolidated statements of condition. Lease right-of-use assets Classification June 30, 2019 Operating lease right-of-use assets Other Assets $ 40,967 Finance lease right-of-use assets Other Assets 2,919 Total lease right-of-use assets $ 43,886 Lease liabilities Classification June 30, 2019 Operating lease right-of-use assets Other Liabilities $ 42,556 Finance lease right-of-use assets Other Liabilities 2,996 Total lease liabilities $ 45,552
Schedule of Weighted Average Remaining Term and Discount Rates	The calculated amount of the ROU assets and lease liabilities in the table above are impacted by the length of the lease term and the discount rate used to present value the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion, which will be determined within the timeframe of the lease agreement, and not included within the calculated ROU. The Company utilizes the discount rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company calculated a blended rate consisting of the Federal Home Loan Bank’s rate matching to the duration of the lease (over-collateralized borrowing rate) and the offering rate of the Company’s most recent subordinated debt offering in June of 2016. For operating leases existing prior to January 1, 2019, the rate for the remaining lease term as of January 1, 2019, was used. For the Company’s only finance lease that commenced December 2018, the Company utilized its blended rate calculation based on the term of the lease. Weighted-average remaining lease term (in years) June 30, 2019 Operating leases 12.1 Finance lease 14.9 Weighted-average discount rate Operating leases 5.48% Finance lease 5.49%
Schedule of Lease Costs and Other Lease Information	The following table represents lease costs and other lease information. As the Company elected, for all classes of underlying assets, not to separate lease and non-lease components and instead to account for them as a single lease component, the variable lease cost primarily represents variable payments such as common area maintenance and utilities. Lease costs Operating lease costs $ 2,527 Variable lease costs 181 Short-term lease costs 94 Finance lease costs Interest on lease liabilities ( 1) 82 Amortization of right-of-use asset 101 Total lease costs $ 2,985 (1) Included in interest expense on Federal Home Loan Advances and other borrowings in the Company's consolidated statement of income. All other lease costs in this table are included in occupancy and equipment expense.
Supplemental Cash Flow Information Related to Leases	Other supplemental cash flow information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 2,342 Operating cash flows from finance leases 82 Financing cash flows from finance leases 54
Future Minimum Payments for Finance and Operating Leases	Future minimum payments for a finance lease and operating leases with initial or remaining terms of one year of more as of June 30, 2019 are as follows: Twelve Months Ended: Finance Operating 2020 $ 274 $ 4,812 2021 278 4,869 2022 282 4,876 2023 286 4,850 2024 291 4,921 Thereafter 2,986 33,713 Total future minimum lease payments $ 4,397 $ 58,041 Less: Imputed interest (1,401 ) (15,485 ) Total lease liabilities $ 2,996 $ 42,556 Future minimum payments for a finance lease and operating leases with initial or remaining terms of one year of more as of December 31, 2018 are as follows: Twelve Months Ended: Finance Operating 2019 $ 272 $ 4,841 2020 276 4,849 2021 280 4,871 2022 284 4,856 2023 288 4,885 Thereafter 3,133 36,178 Total future minimum lease payments $ 4,533 $ 60,480

Share-Based Payments (Tables)

Share-Based Payments (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Fair Value Assumptions of Stock Options	The fair value of options granted was determined using the following weighted-average assumptions as of grant date. June 30, 2019 June 30, 2018 Risk-free interest rate 2.47 % 2.96 % Expected term 7 years 7.5 years Expected stock price volatility 30.64 % 32.09 % Dividend yield 0.57 % 0.00 %
Summary of Company's Stock Option Activities	A summary of the activity in the plans for the six months ended June 30, 2019 follows: Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at December 31, 2018 1,807,922 $ 24.68 6.41 $ 9,581 Granted 91,823 27.83 Exercised (128,125 ) 14.14 Forfeited, expired, or cancelled (18,883 ) 32.74 Outstanding at period end 1,752,737 $ 18.47 6.87 $ 4,113 Vested or expected to vest 1,666,525 $ 25.52 6.13 $ 3,908 Exercisable at period end 839,675 $ 17.32 6.13 $ 8,847
Summary of Stock Options Exercised	For the Six Months Ended June 30, 2019 2018 Stock options exercised: Intrinsic value of options exercised $ 1,869 $ 3,745 Cash received from options exercised 1,277 1,937 Tax benefit realized from option exercises 205 283
Summary of Activity for Nonvested Restricted Share Awards	A summary of activity for non-vested restricted share awards for the six months ended June 30, 2019 is as follows: Non-vested Shares Shares Weighted- Average Grant- Date Fair Value Non-vested at December 31, 2018 176,516 $ 31.07 Granted 1,255 31.87 Vested (70,069 ) 30.33 Forfeited (1,035 ) 32.95 Non-vested at June 30, 2019 106,667
Summary of Vesting Criteria for Restricted Stock Units	The Company began granting restricted stock units in 2019. The following table outlines restricted stock units that were granted, grouped by similar vesting criteria, during the six months ended June 30, 2019. Grant year Units Awarded Service period Period in which units to be settled into shares of common stock 2019 124,661 3.00 2022

Regulatory Capital Matters (Tab

Regulatory Capital Matters (Tables)	6 Months Ended
	Jun. 30, 2019
Regulatory Capital Requirements [Abstract]
Actual and Required Capital Amounts and Ratios	Actual and required capital amounts and ratios are presented below as of June 30, 2019 and December 31, 2018 for the Company and Bank: Actual Required For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Regulations Amount Ratio Amount Ratio Amount Ratio June 30, 2019 Company-Level Company common equity Tier 1 capital to RWA $ 375,710 11.2 % $ 151,266 4.5 % N/A N/A Company Total Capital to RWA $ 462,020 13.7 % $ 268,918 8.0 % N/A N/A Company Tier 1 (Core) Capital to RWA $ 375,710 11.2 % $ 201,689 6.0 % N/A N/A Company Tier 1 (Core) Capital to average assets $ 375,710 9.2 % $ 134,459 4.0 % N/A N/A Bank-Level Bank common equity Tier 1 capital to RWA $ 433,574 12.9 % $ 151,253 4.5 % $ 218,476 6.5 % Bank Total Capital to RWA $ 461,102 13.7 % $ 268,894 8.0 % $ 336,117 10.0 % Bank Tier 1 (Core) Capital to RWA $ 433,574 12.9 % $ 201,670 6.0 % $ 268,894 8.0 % Bank Tier 1 (Core) Capital to average assets $ 433,574 10.6 % $ 163,420 4.0 % $ 204,274 5.0 % December 31, 2018 Company-Level Company common equity Tier 1 capital to RWA $ 367,096 12.2 % $ 135,598 4.5 % N/A N/A Company Total Capital to RWA $ 449,325 14.9 % $ 241,064 8.0 % N/A N/A Company Tier 1 (Core) Capital to RWA $ 367,096 12.2 % $ 180,798 6.0 % N/A N/A Company Tier 1 (Core) Capital to average assets $ 367,096 8.8 % $ 167,553 4.0 % N/A N/A Bank-Level Bank common equity Tier 1 capital to RWA $ 421,335 14.0 % $ 135,613 4.5 % $ 195,886 6.5 % Bank Total Capital to RWA $ 444,871 14.8 % $ 241,090 8.0 % $ 301,363 10.0 % Bank Tier 1 (Core) Capital to RWA $ 421,335 14.0 % $ 180,818 6.0 % $ 241,090 8.0 % Bank Tier 1 (Core) Capital to average assets $ 421,335 10.1 % $ 167,420 4.0 % $ 209,275 5.0 % Note: Minimum ratios presented exclude the capital conservation buffer

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
Schedule of Effects of Fair Value Hedge Relationships Reported in Interest Income on Securities on Consolidated Statements of Income	The effects of fair value hedge relationships reported in interest income on securities on the consolidated statements of income for the three and six months ended June 30, 2019 and 2018 were as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Gain (loss) on fair value hedging relationship 2019 2018 2019 2018 Interest rate swap agreements - securities: Hedged items $ 3,615 $ — $ 4,733 $ — Derivative designated as hedging instruments (3,615 ) — (4,733 ) —
Schedule of Amounts Related to Cumulative Basis Adjustments for Fair Value Hedges	The following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges at June 30, 2019: Carrying Amount of the Hedged Assets (in thousands) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets Line item on the balance sheet June 30, 2019 June 30, 2019 Securities available-for-sale $ 101,205 $ 4,733
Schedule of Effects of Cash Flow Hedge Relationships on Statements of Comprehensive Income (Loss)	The effects of the Company's cash flow hedge relationships on the statement of comprehensive income (loss) during the three and six months ended June 30, 2019 and 2018 were as follows: Amount of Gain Recognized in Other Comprehensive Income (Loss) Amount of Gain Recognized in Other Comprehensive Income (Loss) Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Liability derivatives Interest rate swap agreements $ (1,231 ) $ — $ (1,231 ) $ —
Fair Value Hedge [Member]
Schedule of Derivatives Designated Hedge Relationships	A summary of the Company's fair value hedge relationships as of June 30, 2019 are as follows (in thousands): June 30, 2019 Balance Sheet Location Weighted Average Remaining Maturity (In Years) Weighted Average Pay Rate Receive Rate Notional Amount Estimated Fair Value Liability derivative Interest rate swap agreements - securities Other liabilities 7.23 2.527% 3 month LIBOR $ 101,205 $ 4,733
Cash Flow Hedge [Member]
Schedule of Derivatives Designated Hedge Relationships	A summary of the Company's cash flow hedge relationships as of June 30, 2019 are as follows (in thousands): June 30, 2019 Balance Sheet Location Weighted Average Remaining Maturity (In Years) Weighted Average Pay Rate Receive Rate Notional Amount Estimated Fair Value Liability derivatives Interest rate swap agreements Other liabilities 2 2.232% 3 month LIBOR $ 100,000 $ 1,667

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Summary of Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk	The contractual amounts of financial instruments with off-balance sheet risk were as follows: June 30, 2019 December 31, 2018 Unused lines of credit $ 801,049 $ 654,584 Standby letters of credit 52,064 40,024 Unfunded loan commitments 63,707 28,731

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which the Company has elected the fair value option, are summarized below: Fair Value Measurements at June 30, 2019 Using: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets Securities available for sale U.S. government sponsored entities and agencies $ — 1,688 $ — Mortgage-backed securities-residential — 474,051 — Mortgage-backed securities-commercial — 18,699 — Asset-backed securities — 25,208 — Corporate notes — 22,716 — State and political subdivisions — 172,770 — Total securities available for sale $ — $ 715,132 $ — Loans held for sale $ — $ 27,093 $ — Other assets $ — $ 278 $ — Financial Liabilities Other liabilities $ — $ 6,580 $ — Fair Value Measurements at December 31, 2018 Using: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets Securities available for sale U.S. Treasury securities $ 253,014 $ — $ — U.S. government sponsored entities and agencies — 21,888 — Mortgage-backed securities-residential — 580,699 — Asset-backed securities — 24,844 — Corporate notes 12,424 State and political subdivisions — 137,799 — Total securities available for sale $ 253,014 $ 777,654 $ — Loans held for sale $ — $ 11,103 $ — Other assets $ — $ 206 $ — Financial Liabilities Other liabilities $ — $ 129 $ —
Carrying Amount and Estimated Fair Value of Financial Instruments	The carrying amounts and estimated fair values of financial instruments at June 30, 2019 and December 31, 2018 are as follows: Fair Value Measurements at June 30, 2019 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 150,721 $ 150,721 $ — $ — $ 150,721 Certificates of deposit held at other financial institutions 3,840 — 3,840 — 3,840 Securities available for sale 715,132 — 715,132 — 715,132 Securities held to maturity 118,963 — 120,809 — 120,809 Loans held for sale 27,093 — 27,093 — 27,093 Net loans 2,852,990 — — 2,886,557 2,886,557 Servicing rights, net 3,299 — — 3,905 3,905 Other assets 278 — 278 — 278 Accrued interest receivable 14,281 136 5,196 8,950 14,282 Financial liabilities Deposits $ 3,146,645 $ 2,182,888 $ 965,228 $ — $ 3,148,116 Federal Home Loan Bank advances 396,500 — 396,624 — 396,624 Subordinated notes, net 58,782 — — 61,438 61,438 Other liabilities 6,580 — 6,580 — 6,580 Accrued interest payable 4,312 179 687 3,446 4,312 Fair Value Measurements at December 31, 2018 Using: Carrying Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 280,212 $ 280,212 $ — $ — $ 280,212 Certificates of deposit held at other financial institutions 3,594 — 3,594 — 3,594 Securities available for sale 1,030,668 253,014 777,654 — 1,030,668 Securities held to maturity 121,617 — 118,955 — 118,955 Loans held for sale 11,103 — 11,103 — 11,103 Net loans 2,641,948 — — 2,622,386 2,622,386 Servicing rights, net 3,403 — — 4,836 4,836 Other assets 206 — 206 — 206 Accrued interest receivable 13,337 71 5,539 7,727 13,337 Financial liabilities Deposits $ 3,431,807 $ 2,105,951 $ 1,319,326 $ — $ 3,425,277 Federal Home Loan Bank advances 368,500 — 366,786 — 366,786 Subordinated notes, net 58,693 — — 59,852 59,852 Other liabilities 129 — 129 — 129 Accrued interest payable 4,700 146 3,866 688 4,700

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Computation of Earnings per Share	The factors used in the earnings per share computation follow: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Basic Net income available to common shareholders $ 5,173 $ 10,161 $ 8,075 $ 20,213 Less: earnings allocated to participating securities (41 ) (118 ) (79 ) (192 ) Net income allocated to common shareholders $ 5,132 $ 10,043 $ 7,996 $ 20,021 Weighted average common shares outstanding including participating securities 14,599,407 14,383,493 14,580,370 13,819,742 Less: Participating securities (117,063 ) (167,381 ) (143,043 ) (130,898 ) Average shares 14,482,344 14,216,112 14,437,327 13,688,844 Basic earnings per common share $ 0.35 $ 0.71 $ 0.55 $ 1.46 Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Diluted Net income allocated to common shareholders $ 5,132 $ 10,043 $ 7,996 $ 20,021 Weighted average common shares outstanding for basic earnings per common share 14,482,344 14,216,112 14,437,327 13,688,844 Add: Dilutive effects of assumed exercises of stock options 341,777 597,947 376,762 557,307 Add: Dilutive effects of assumed restricted stock units 70,019 — 35,203 — Average shares and dilutive potential common shares 14,894,140 14,814,059 14,849,292 14,246,151 Dilutive earnings per common share $ 0.34 $ 0.68 $ 0.54 $ 1.41

Subordinated Debt Issuance (Tab

Subordinated Debt Issuance (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Summary of Terms of Each Subordinated Note offering	The following table summarizes the terms of each subordinated note offering: March 2016 Subordinated Notes June 2016 Subordinated Notes Principal amount issued $40,000 $20,000 Maturity date March 30, 2026 July 1, 2026 Initial fixed interest rate 6.875% 7.00% Initial interest rate period 5 years 5 years First interest rate change date March 30, 2021 July 1, 2021 Interest payment frequency through year five* Semiannually Semiannually Interest payment frequency after five years* Quarterly Quarterly Interest repricing index and margin 3-month LIBOR plus 5.636% 3-month LIBOR plus 6.04% Repricing frequency after five years Quarterly Quarterly

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use asset	$ 40,967	$ 43,723
Lease liability	42,556	$ 43,723
ASU 2017-08 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Recognized cumulative effect reduction to retained earnings	$ 2,244

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	$ 717,308	$ 1,051,436
Gross Unrealized Gains	2,355	971
Gross Unrealized Losses	(4,531)	(21,739)
Fair Value	715,132	1,030,668
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total		253,015
Gross Unrealized Gains		59
Gross Unrealized Losses		(60)
Fair Value		253,014
U.S. Government Sponsored Entities and Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	1,695	21,999
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(8)	(112)
Fair Value	1,688	21,888
Mortgage-Backed Securities: Residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	476,378	596,766
Gross Unrealized Gains	1,417	27
Gross Unrealized Losses	(3,744)	(16,094)
Fair Value	474,051	580,699
Mortgage-Backed Securities: Commercial [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	18,544
Gross Unrealized Gains	275
Gross Unrealized Losses	(120)
Fair Value	18,699
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	25,746	25,744
Gross Unrealized Gains	27
Gross Unrealized Losses	(565)	(900)
Fair Value	25,208	24,844
Corporate Notes [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	22,360	12,480
Gross Unrealized Gains	356	21
Gross Unrealized Losses		(77)
Fair Value	22,716	12,424
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Total	172,585	141,432
Gross Unrealized Gains	279	863
Gross Unrealized Losses	(94)	(4,496)
Fair Value	$ 172,770	$ 137,799

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity Portfolio (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 118,963	$ 121,617
Gross Unrecognized Gains	2,875	500
Gross Unrecognized Losses	(1,029)	(3,162)
Fair Value	120,809	118,955
Mortgage-Backed Securities: Residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	74,163	75,944
Gross Unrecognized Gains	198	34
Gross Unrecognized Losses	(1,029)	(3,072)
Fair Value	73,332	72,906
State and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	44,800	45,673
Gross Unrecognized Gains	2,677	466
Gross Unrecognized Losses		(90)
Fair Value	$ 47,477	$ 46,049

Securities - Summary of Proceed

Securities - Summary of Proceeds from Sales and Calls of Securities Available for Sale and Associated Gains and Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Available For Sale Securities [Abstract]
Proceeds	$ 87,424	$ 1	$ 347,037	$ 1
Gross gains	$ 367	$ 1	2,168	$ 1
Gross losses			$ (1,651)

Securities - Schedule of Amor_2

Securities - Schedule of Amortized Cost and Fair Value of Investment Securities Portfolio by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available for sale
Amortized Cost, One year or less	$ 10,502
Amortized Cost, Over one year through five years	697
Amortized Cost, Over five years through ten years	27,586
Amortized Cost, Over ten years	157,855
Amortized Cost, Total	717,308	$ 1,051,436
Held to maturity
Amortized Cost, Over one year through five years	1,106
Amortized Cost, Over five years through ten years	1,034
Amortized Cost, Over ten years	42,660
Amortized Cost	118,963	121,617
Available for sale
Fair Value, One year or less	10,498
Fair Value, Over one year through five years	697
Fair Value, Over five years through ten years	28,033
Fair Value, Over ten years	157,946
Fair Value, Total	715,132	1,030,668
Held to maturity
Fair Value, Over one year through five years	1,138
Fair Value, Over five years through ten years	1,076
Fair Value, Over ten years	45,263
Fair Value, Total	120,809	118,955
Asset-backed Securities [Member]
Available for sale
Amortized Cost, Mortgage-backed securities not due at a single maturity date	25,746
Amortized Cost, Total	25,746	25,744
Available for sale
Fair Value, Mortgage-backed securities not due at a single maturity date	25,208
Fair Value, Total	25,208	24,844
Mortgage-Backed Securities: Residential [Member]
Available for sale
Amortized Cost, Mortgage-backed securities not due at a single maturity date	476,378
Amortized Cost, Total	476,378	596,766
Held to maturity
Amortized Cost, Mortgage-backed securities not due at a single maturity date	74,163
Amortized Cost	74,163	75,944
Available for sale
Fair Value, Mortgage-backed securities not due at a single maturity date	474,051
Fair Value, Total	474,051	580,699
Held to maturity
Fair Value, Mortgage-backed securities not due at a single maturity date	73,332
Fair Value, Total	73,332	$ 72,906
Mortgage-Backed Securities: Commercial [Member]
Available for sale
Amortized Cost, Mortgage-backed securities not due at a single maturity date	18,544
Amortized Cost, Total	18,544
Available for sale
Fair Value, Mortgage-backed securities not due at a single maturity date	18,699
Fair Value, Total	$ 18,699

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	Jun. 30, 2019USD ($)Security	Dec. 31, 2018USD ($)Security
Marketable Securities [Line Items]
Carrying value of pledged securities | $	$ 468,429	$ 939,440
Other than US Government Sponsored Entities and Agencies [Member]
Marketable Securities [Line Items]
Amount of holdings of securities of any one issuer | Security	0	0

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Losses and Fair Value by Major Security Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	$ 41,142	$ 293,410
Less Than 12 Months Available for sale Unrealized Losses	(613)	(1,910)
12 Months or Longer Available for sale Fair Value	367,392	579,927
12 Months or Longer Available for sale Unrealized Losses	(3,918)	(19,829)
Available for sale Fair Value, Total	408,534	873,337
Available for sale Unrealized Losses, Total	(4,531)	(21,739)
Less Than 12 Months Held to maturity Fair Value	1,639	10,601
Less Than 12 Months Held to maturity Unrealized Losses	(6)	(79)
12 Months or Longer Held to maturity Fair Value	59,548	71,742
12 Months or Longer Held to maturity Unrealized Losses	(1,023)	(3,083)
Held to maturity Fair Value, Total	61,187	82,343
Held to maturity Unrealized Losses, Total	(1,029)	(3,162)
U.S. Treasury Securities [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value		163,722
Less Than 12 Months Available for sale Unrealized Losses		(60)
Available for sale Fair Value, Total		163,722
Available for sale Unrealized Losses, Total		(60)
U.S. Government Sponsored Entities and Agencies [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	48	1,355
Less Than 12 Months Available for sale Unrealized Losses		(12)
12 Months or Longer Available for sale Fair Value	483	19,937
12 Months or Longer Available for sale Unrealized Losses	(8)	(100)
Available for sale Fair Value, Total	531	21,292
Available for sale Unrealized Losses, Total	(8)	(112)
Mortgage-Backed Securities: Residential [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	8,385	83,203
Less Than 12 Months Available for sale Unrealized Losses	(44)	(755)
12 Months or Longer Available for sale Fair Value	329,225	490,752
12 Months or Longer Available for sale Unrealized Losses	(3,700)	(15,339)
Available for sale Fair Value, Total	337,610	573,955
Available for sale Unrealized Losses, Total	(3,744)	(16,094)
Less Than 12 Months Held to maturity Fair Value	1,639	2,239
Less Than 12 Months Held to maturity Unrealized Losses	(6)	(40)
12 Months or Longer Held to maturity Fair Value	59,548	68,067
12 Months or Longer Held to maturity Unrealized Losses	(1,023)	(3,032)
Held to maturity Fair Value, Total	61,187	70,306
Held to maturity Unrealized Losses, Total	(1,029)	(3,072)
Mortgage-Backed Securities: Commercial [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
12 Months or Longer Available for sale Fair Value	7,532
12 Months or Longer Available for sale Unrealized Losses	(120)
Available for sale Fair Value, Total	7,532
Available for sale Unrealized Losses, Total	(120)
Asset-backed Securities [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	22,713	24,845
Less Than 12 Months Available for sale Unrealized Losses	(565)	(900)
Available for sale Fair Value, Total	22,713	24,845
Available for sale Unrealized Losses, Total	(565)	(900)
Corporate Notes [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value		9,839
Less Than 12 Months Available for sale Unrealized Losses		(77)
Available for sale Fair Value, Total		9,839
Available for sale Unrealized Losses, Total		(77)
State and Political Subdivisions [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	9,996	10,446
Less Than 12 Months Available for sale Unrealized Losses	(4)	(106)
12 Months or Longer Available for sale Fair Value	30,152	69,238
12 Months or Longer Available for sale Unrealized Losses	(90)	(4,390)
Available for sale Fair Value, Total	40,148	79,684
Available for sale Unrealized Losses, Total	$ (94)	(4,496)
Less Than 12 Months Held to maturity Fair Value		8,362
Less Than 12 Months Held to maturity Unrealized Losses		(39)
12 Months or Longer Held to maturity Fair Value		3,675
12 Months or Longer Held to maturity Unrealized Losses		(51)
Held to maturity Fair Value, Total		12,037
Held to maturity Unrealized Losses, Total		$ (90)

Loans - Summary of Loans (Detai

Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,884,510		$ 2,667,943
Deferred loan fees, net	(4,077)		(2,544)
Total loans	2,880,433		2,665,399
Allowance for loan losses	(27,443)	$ (27,857)	(23,451)	$ (22,341)	$ (21,738)	$ (21,247)
Net loans	2,852,990		2,641,948
Commercial Real Estate Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonfarm, nonresidential	894,910		754,243
Commercial Real Estate, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other	37,845		48,017
Real Estate Residential Closed-end 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Closed-end 1-4 family	496,597		493,065
Residential Real Estate, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other	197,549		189,817
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Construction and land development	584,599		584,440
Allowance for loan losses	(4,784)	(4,742)	(4,743)	(4,613)	(4,345)	(3,802)
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	668,065		592,793
Allowance for loan losses	(10,118)	(11,229)	(7,166)	(6,976)	(7,866)	(7,587)
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer and other	4,945		5,568
Allowance for loan losses	$ (56)	$ (49)	$ (74)	$ (56)	$ (47)	$ (43)

Loans - Activity in Allowance f

Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 27,857	$ 21,738	$ 23,451	$ 21,247
Provision for loan losses	7,031	570	12,086	1,143
Loans charged-off	(7,592)	(5)	(8,245)	(111)
Recoveries	147	38	151	62
Total ending allowance balance	27,443	22,341	27,443	22,341
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,742	4,345	4,743	3,802
Provision for loan losses	42	267	41	848
Loans charged-off				(38)
Recoveries		1		1
Total ending allowance balance	4,784	4,613	4,784	4,613
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	7,027	5,875	6,725	5,981
Provision for loan losses	614	288	916	182
Total ending allowance balance	7,641	6,163	7,641	6,163
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,810	3,605	4,743	3,834
Provision for loan losses	18	909	101	668
Loans charged-off			(15)	(7)
Recoveries	16	19	15	38
Total ending allowance balance	4,844	4,533	4,844	4,533
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	11,229	7,866	7,166	7,587
Provision for loan losses	6,382	(900)	11,012	(572)
Loans charged-off	(7,563)		(8,131)	(49)
Recoveries	70	10	71	10
Total ending allowance balance	10,118	6,976	10,118	6,976
Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	49	47	74	43
Provision for loan losses	(25)	6	16	17
Loans charged-off	(29)	(5)	(99)	(17)
Recoveries	61	8	65	13
Total ending allowance balance	$ 56	$ 56	$ 56	$ 56

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Individually evaluated for impairment	$ 2,193		$ 17
Allowance for loan losses, Collectively evaluated for impairment	25,250		23,434
Total ending allowance balance	27,443	$ 27,857	23,451	$ 22,341	$ 21,738	$ 21,247
Loans, Individually evaluated for impairment	4,030		5,654
Loans, Collectively evaluated for impairment	2,880,480		2,662,289
Total ending loans balance	2,884,510		2,667,943
Construction and Land Development [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	4,784		4,743
Total ending allowance balance	4,784	4,742	4,743	4,613	4,345	3,802
Loans, Individually evaluated for impairment			2,298
Loans, Collectively evaluated for impairment	584,599		582,142
Total ending loans balance	584,599		584,440
Commercial Real Estate [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	7,641		6,725
Total ending allowance balance	7,641	7,027	6,725	6,163	5,875	5,981
Loans, Collectively evaluated for impairment	932,755		802,260
Total ending loans balance	932,755		802,260
Residential Real Estate [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	4,844		4,743
Total ending allowance balance	4,844	4,810	4,743	4,533	3,605	3,834
Loans, Individually evaluated for impairment	1,837		3,189
Loans, Collectively evaluated for impairment	692,309		679,693
Total ending loans balance	694,146		682,882
Commercial and Industrial [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Individually evaluated for impairment	2,193		17
Allowance for loan losses, Collectively evaluated for impairment	7,925		7,149
Total ending allowance balance	10,118	11,229	7,166	6,976	7,866	7,587
Loans, Individually evaluated for impairment	2,193		167
Loans, Collectively evaluated for impairment	665,872		592,626
Total ending loans balance	668,065		592,793
Consumer and Other [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	56		74
Total ending allowance balance	56	$ 49	74	$ 56	$ 47	$ 43
Loans, Collectively evaluated for impairment	4,945		5,568
Total ending loans balance	$ 4,945		$ 5,568

Loans - Additional Information

Loans - Additional Information (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable carrying amount	$ 2,884,510	$ 2,667,943
Unpaid principal amount	7,566	5,662
Allowance for loan losses	$ 27,443	$ 23,451	$ 27,857	$ 22,341	$ 21,738	$ 21,247
Number of loans modified as troubled debt restructuring	1	1
Loans modified as troubled debt restructuring, Amount	$ 316	$ 167
Non PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable carrying amount	72,774
Unpaid principal amount	73,717
Estimated credit discount	943
Allowance for loan losses	$ 115

Loans - Summary of Impaired Loa

Loans - Summary of Impaired Loans by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	$ 1,844		$ 1,844		$ 5,495
Unpaid Principal Balance, With an allowance recorded	5,722		5,722		167
Unpaid Principal Balance	7,566		7,566		5,662
Recorded Investment, With no allowance recorded	1,837		1,837		5,487
Recorded Investment, With an allowance recorded	2,193		2,193		167
Recorded Investment	4,030		4,030		5,654
Allowance for Loan Losses Allocated	2,193		2,193		17
Average Recorded Investment, With no allowance recorded	4,405	$ 1,491	3,646	$ 1,591
Average Recorded Investment, With an allowance recorded	4,404	1,638	3,878	1,785
Total average recorded investment	8,809	3,129	7,524	3,376
Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	491		491		1,280
Recorded Investment, With no allowance recorded	484		484		1,272
Average Recorded Investment, With no allowance recorded	681	496	744	432
Residential Real Estate, Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	1,353		1,353		1,917
Recorded Investment, With no allowance recorded	1,353		1,353		1,917
Average Recorded Investment, With no allowance recorded	1,086	112	1,174	192
Commercial Real Estate Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, With no allowance recorded			25
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With an allowance recorded	5,722		5,722		167
Recorded Investment, With an allowance recorded	2,193		2,193		167
Allowance for Loan Losses Allocated	2,193		2,193		17
Average Recorded Investment, With no allowance recorded	2,638	883	1,319	867
Average Recorded Investment, With an allowance recorded	$ 4,404	$ 1,638	3,787	1,785
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded					2,298
Recorded Investment, With no allowance recorded					$ 2,298
Average Recorded Investment, With no allowance recorded			384	$ 100
Average Recorded Investment, With an allowance recorded			$ 91

Loans - Schedule of Recorded In

Loans - Schedule of Recorded Investment in Nonaccrual and Loans Past Due Over 90 Days on Accrual by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Nonaccrual	$ 4,030	$ 5,488
Recorded Investment, Loans Past Due Over 90 Days and Still Accruing Interest	676	208
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Nonaccrual		2,298
Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Nonaccrual	484	1,273
Residential Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Nonaccrual	1,353	1,917
Recorded Investment, Loans Past Due Over 90 Days and Still Accruing Interest	250
Commercial and Industrial Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Nonaccrual	2,193
Recorded Investment, Loans Past Due Over 90 Days and Still Accruing Interest	$ 426	$ 208

Loans - Schedule of Aging of Re

Loans - Schedule of Aging of Recorded Investment in Past Due Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	$ 5,662	$ 9,018
Aging of Recorded Investment, Loans Not Past Due	2,878,848	2,658,925
Total ending loans balance	2,884,510	2,667,943
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	380	2,828
Aging of Recorded Investment, Loans Not Past Due	584,219	581,612
Total ending loans balance	584,599	584,440
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	3,509	701
Aging of Recorded Investment, Loans Not Past Due	664,556	592,092
Total ending loans balance	668,065	592,793
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	33
Aging of Recorded Investment, Loans Not Past Due	4,912	5,568
Total ending loans balance	4,945	5,568
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1,202	3,582
30 to 59 Days Past Due [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		294
30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	601	241
30 to 59 Days Past Due [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	33
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1,073	2,642
60 to 89 Days Past Due [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	380	1,986
60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	289	252
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	3,387	2,794
Greater Than 90 Days Past Due [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		548
Greater Than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	2,619	208
Commercial Real Estate Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		515
Aging of Recorded Investment, Loans Not Past Due	894,910	753,728
Total ending loans balance	894,910	754,243
Commercial Real Estate Financing Receivable [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		515
Commercial Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Loans Not Past Due	37,845	48,017
Total ending loans balance	37,845	48,017
Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	509	3,022
Aging of Recorded Investment, Loans Not Past Due	496,088	490,043
Total ending loans balance	496,597	493,065
Real Estate Residential Closed-end 1-4 Family [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	350	2,390
Real Estate Residential Closed-end 1-4 Family [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		404
Real Estate Residential Closed-end 1-4 Family [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	159	228
Residential Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1,231	1,952
Aging of Recorded Investment, Loans Not Past Due	196,318	187,865
Total ending loans balance	197,549	189,817
Residential Real Estate, Other [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	218	142
Residential Real Estate, Other [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	404
Residential Real Estate, Other [Member] | Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	$ 609	$ 1,810

Loans - Summary of Risk Categor

Loans - Summary of Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Risk Category Of Loans [Line Items]
Total Loans	$ 2,884,510	$ 2,667,943
Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	584,599	584,440
Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	668,065	592,793
Consumer and Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	4,945	5,568
Pass [Member]
Risk Category Of Loans [Line Items]
Total Loans	2,852,488	2,603,376
Pass [Member] | Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	584,251	580,468
Pass [Member] | Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	642,120	553,589
Pass [Member] | Consumer and Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	4,945	5,567
Special Mention [Member]
Risk Category Of Loans [Line Items]
Total Loans	3,871	25,856
Special Mention [Member] | Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	113	1,416
Special Mention [Member] | Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	2,662	8,313
Special Mention [Member] | Consumer and Other [Member]
Risk Category Of Loans [Line Items]
Total Loans		1
Substandard [Member]
Risk Category Of Loans [Line Items]
Total Loans	28,151	38,711
Substandard [Member] | Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	235	2,556
Substandard [Member] | Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	23,283	30,891
Commercial Real Estate Financing Receivable [Member]
Risk Category Of Loans [Line Items]
Total Loans	894,910	754,243
Commercial Real Estate Financing Receivable [Member] | Pass [Member]
Risk Category Of Loans [Line Items]
Total Loans	894,430	739,469
Commercial Real Estate Financing Receivable [Member] | Special Mention [Member]
Risk Category Of Loans [Line Items]
Total Loans	480	14,774
Commercial Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	37,845	48,017
Commercial Real Estate, Other [Member] | Pass [Member]
Risk Category Of Loans [Line Items]
Total Loans	37,229	48,017
Commercial Real Estate, Other [Member] | Special Mention [Member]
Risk Category Of Loans [Line Items]
Total Loans	616
Real Estate Residential Closed-end 1-4 Family [Member]
Risk Category Of Loans [Line Items]
Total Loans	496,597	493,065
Real Estate Residential Closed-end 1-4 Family [Member] | Pass [Member]
Risk Category Of Loans [Line Items]
Total Loans	494,306	489,781
Real Estate Residential Closed-end 1-4 Family [Member] | Special Mention [Member]
Risk Category Of Loans [Line Items]
Total Loans		948
Real Estate Residential Closed-end 1-4 Family [Member] | Substandard [Member]
Risk Category Of Loans [Line Items]
Total Loans	2,291	2,336
Residential Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	197,549	189,817
Residential Real Estate, Other [Member] | Pass [Member]
Risk Category Of Loans [Line Items]
Total Loans	195,207	186,485
Residential Real Estate, Other [Member] | Special Mention [Member]
Risk Category Of Loans [Line Items]
Total Loans		404
Residential Real Estate, Other [Member] | Substandard [Member]
Risk Category Of Loans [Line Items]
Total Loans	$ 2,342	$ 2,928

Loan Servicing - Schedule of Lo

Loan Servicing - Schedule of Loans Serviced Not Reported as Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Federal Home Loan Mortgage Corporation [Member]
Loans Servicing For Institutional Investors [Line Items]
Loans serviced for others	$ 491,388	$ 492,761
Other Serviced Loans [Member]
Loans Servicing For Institutional Investors [Line Items]
Loans serviced for others	$ 3,614	$ 3,689

Loan Servicing - Related Loan S

Loan Servicing - Related Loan Servicing Rights Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Servicing Asset At Amortized Value Additional Disclosures [Abstract]
Beginning of period	$ 3,366	$ 3,602	$ 3,403	$ 3,620
Additions	196	161	383	357
Amortized to expense	(263)	(227)	(487)	(441)
End of period	$ 3,299	$ 3,536	$ 3,299	$ 3,536

Loan Servicing - Components of

Loan Servicing - Components of Net Loan Servicing Fees (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Transfers And Servicing [Abstract]
Loan servicing fees	$ 312	$ 330	$ 618	$ 663
Amortization of loan servicing fees	(263)	(227)	(487)	(441)
Total	$ 49	$ 103	$ 131	$ 222

Loan Servicing - Additional Inf

Loan Servicing - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Transfers And Servicing [Abstract]
Fair value of servicing rights	$ 3,905	$ 4,836
Weighted average discount rate	9.50%	9.50%
Weighted average prepayment speed	16.40%	11.90%

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease term extending year		2033
Operating lease,extending description		Substantially all of the leases in which the Company is the lessee are comprised of real estate property for branches and office space with terms extending through 2033.
Option to extend, operating lease		true
Finanacing lease term extending year		2033
Financing lease,extending description		The Company has one existing finance lease for additional office space with a lease term through 2033.
Option to extend, finance lease		true
Rent expense	$ 1,319		$ 2,547

Leases - Summary of Consolidate

Leases - Summary of Consolidated Statements of Condition Classification of ROU Assets And Lease Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Lease right-of-use assets
Operating lease right-of-use assets	$ 40,967	$ 43,723
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Finance lease right-of-use assets	$ 2,919
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Total lease right-of-use assets	$ 43,886
Lease liabilities
Operating lease right-of-use assets	$ 42,556	$ 43,723
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities
Finance lease right-of-use assets	$ 2,996
Finance Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities
Total lease liabilities	$ 45,552

Leases - Schedule of Weighted A

Leases - Schedule of Weighted Average Remaining Term and Discount Rates (Detail)	Jun. 30, 2019
Weighted-average remaining lease term (in years)
Operating leases	12 years 1 month 6 days
Finance lease	14 years 10 months 24 days
Weighted-average discount rate
Operating leases	5.48%
Finance lease	5.49%

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Costs And Other Lease Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Lease costs
Operating lease costs	$ 2,527
Variable lease costs	181
Short-term lease costs	94
Finance lease costs
Interest on lease liabilities	82
Amortization of right-of-use asset	101
Total lease costs	$ 2,985

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 2,342
Operating cash flows from finance leases	82
Financing cash flows from finance leases	$ 54

Leases - Future Minimum Payment

Leases - Future Minimum Payments For Finance Lease And Operating Leases With Initial Or Remaining Terms (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Finance
2020	$ 274
2021	278
2022	282
2023	286
2024	291
Thereafter	2,986
Total future minimum lease payments	4,397
Less: Imputed interest	(1,401)
Total lease liabilities	2,996
Operating
2020	4,812
2021	4,869
2022	4,876
2023	4,850
2024	4,921
Thereafter	33,713
Total future minimum lease payments	58,041
Less: Imputed interest	(15,485)
Total lease liabilities	$ 42,556	$ 43,723
Finance
2019			$ 272
2020			276
2021			280
2022			284
2023			288
Thereafter			3,133
Total future minimum lease payments			4,533
Operating
2019			4,841
2020			4,849
2021			4,871
2022			4,856
2023			4,885
Thereafter			36,178
Total future minimum lease payments			$ 60,480

Share-Based Payments - Addition

Share-Based Payments - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)shares	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)Plan$ / sharesshares	Jun. 30, 2018USD ($)$ / shares	Apr. 12, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans | Plan			2
Compensation cost charged against income	$ 1,513,000	$ 2,842,000	$ 1,318,000	$ 2,078,000
Excess tax benefit related to vesting of restricted stock and exercise of stock options	$ 92,000	220,000	$ 205,000	$ 283,000
Stock Option [Member] | Amended and Restated 2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares					3,500,000
Number of shares authorized for issuance | shares	2,421,000		2,421,000
Stock Option [Member] | 2007 Omnibus Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares	4,000,000		4,000,000
Options contractual term			10 years
Weighted average fair value of options | $ / shares			$ 9.78	$ 12.03
Unrecognized compensation cost, nonvested stock options	$ 4,786,000		$ 4,786,000
Unrecognized compensation cost, period of recognition			1 year 11 months 19 days
Stock Option [Member] | 2017 Omnibus Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares			3 years
Stock Option [Member] | 2017 Omnibus Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares			5 years
Restricted Stock [Member] | 2007 Omnibus Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares			3 years
Restricted Stock [Member] | 2007 Omnibus Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares			5 years
Restricted Stock [Member] | 2017 Omnibus Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares			3 years
Restricted Stock [Member] | 2017 Omnibus Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares			5 years
Restricted Stock [Member] | 2007 Omnibus Equity Incentive Plan and Amended and Restated 2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, nonvested stock options	1,713,000		$ 1,713,000
Unrecognized compensation cost, period of recognition			1 year 3 months 18 days
Restricted Stock Units [Member] | 2017 Omnibus Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	483,000	$ 0	$ 579,000	$ 0
Restricted Stock Units [Member] | 2007 Omnibus Equity Incentive Plan and Amended and Restated 2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, nonvested stock options	$ 3,814,000		$ 3,814,000
Unrecognized compensation cost, period of recognition			2 years 9 months

Share-Based Payments - Fair Val

Share-Based Payments - Fair Value Assumptions of Stock Options (Detail)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	2.47%	2.96%
Expected term	7 years	7 years 6 months
Expected stock price volatility	30.64%	32.09%
Dividend yield	0.57%	0.00%

Share-Based Payments - Summary

Share-Based Payments - Summary of Company's Stock Options Activities (Detail) - Stock Option [Member] - 2007 and 2017 Omnibus Equity Incentive Plan [Member] $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at period beginning | shares	1,807,922
Shares, Granted | shares	91,823
Shares, Exercised | shares	(128,125)
Shares, Forfeited, expired, or cancelled | shares	(18,883)
Shares, Outstanding at period end | shares	1,752,737	1,807,922
Shares, Vested or expected to vest | shares	1,666,525
Shares, Exercisable at period end | shares	839,675
Weighted Average Exercise Price, Outstanding at period beginning | $ / shares	$ 24.68
Weighted Average Exercise Price, Granted | $ / shares	27.83
Weighted Average Exercise Price, Exercised | $ / shares	14.14
Weighted Average Exercise Price, Forfeited, expired, or cancelled | $ / shares	32.74
Weighted Average Exercise Price, Outstanding at period end | $ / shares	18.47	$ 24.68
Weighted Average Exercise Price, Vested or expected to vest | $ / shares	25.52
Weighted Average Exercise Price, Exercisable at period end | $ / shares	$ 17.32
Weighted Average Remaining Contractual Term, Outstanding Balance	6 years 10 months 13 days	6 years 4 months 28 days
Weighted Average Remaining Contractual Term, Vested or expected to vest	6 years 1 month 17 days
Weighted Average Remaining Contractual Term, Exercisable at period end	6 years 1 month 17 days
Aggregate Intrinsic Value, Outstanding | $	$ 4,113	$ 9,581
Aggregate Intrinsic Value, Vested or expected to vest | $	3,908
Aggregate Intrinsic Value, Exercisable at period end | $	$ 8,847

Share-Based Payments - Summar_2

Share-Based Payments - Summary of Stock Options Exercised (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Stock options exercised:
Cash received from options exercised	$ 1,277	$ 1,937
Stock Option [Member] | 2007 and 2017 Omnibus Equity Incentive Plan [Member]
Stock options exercised:
Intrinsic value of options exercised	1,869	3,745
Cash received from options exercised	1,277	1,937
Tax benefit realized from option exercises	$ 205	$ 283

Share-Based Payments - Summar_3

Share-Based Payments - Summary of Activity for Nonvested Restricted Share Awards (Detail) - Restricted Stock [Member] - 2007 and 2017 Omnibus Equity Incentive Plan [Member]	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Non-vested, Beginning Balance	176,516
Shares, Granted	1,255
Shares, Vested	(70,069)
Shares, Forfeited	(1,035)
Shares, Non-vested, Ending Balance	106,667
Weighted-Average Grant-Date Fair Value, Non-vested, Beginning Balance | $ / shares	$ 31.07
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	31.87
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	30.33
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	$ 32.95

Share-Based Payments - Summar_4

Share-Based Payments - Summary of Vesting Criteria for Restricted Stock Units (Detail) - Restricted Stock Units [Member] - 2007 and 2017 Omnibus Equity Incentive Plan [Member]	6 Months Ended
	Jun. 30, 2019shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant year	2019
Units Awarded	124,661
Service period	3 years
Period in which units to be settled into shares of common stock	2022

Regulatory Capital Matters - Ad

Regulatory Capital Matters - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019
Banking And Thrift [Abstract]
Capital conservation buffer	2.50%
Capital conservation buffer ratio to be phased in at beginning	0.625%
Capital conservation buffer phase in year	2016
Capital conservation buffer period final year	2019

Regulatory Capital Matters - Ac

Regulatory Capital Matters - Actual and Required Capital Amounts and Ratios (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital to RWA, Actual Amount	$ 375,710	$ 367,096
Total Capital to RWA, Actual Amount	462,020	449,325
Tier 1 (Core) Capital to RWA, Actual Amount	375,710	367,096
Tier 1 (Core) Capital to average assets, Actual Amount	$ 375,710	$ 367,096
Common equity Tier 1 capital to RWA	11.20%	12.20%
Total Capital to RWA, Actual Ratio	13.70%	14.90%
Tier 1 (Core) Capital to RWA, Actual Ratio	11.20%	12.20%
Tier 1 (Core) Capital to average assets, Actual Ratio	9.20%	8.80%
Common equity Tier 1 capital to RWA	$ 151,266	$ 135,598
Total Capital to RWA, Required For Capital Adequacy Purposes Amount	268,918	241,064
Tier 1 (Core) Capital to RWA, Required For Capital Adequacy Purposes Amount	201,689	180,798
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Amount	$ 134,459	$ 167,553
Common equity Tier 1 capital to RWA	4.50%	4.50%
Total Capital to RWA, Required For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 (Core) Capital to RWA, Required For Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Ratio	4.00%	4.00%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital to RWA, Actual Amount	$ 433,574	$ 421,335
Total Capital to RWA, Actual Amount	461,102	444,871
Tier 1 (Core) Capital to RWA, Actual Amount	433,574	421,335
Tier 1 (Core) Capital to average assets, Actual Amount	$ 433,574	$ 421,335
Common equity Tier 1 capital to RWA	12.90%	14.00%
Total Capital to RWA, Actual Ratio	13.70%	14.80%
Tier 1 (Core) Capital to RWA, Actual Ratio	12.90%	14.00%
Tier 1 (Core) Capital to average assets, Actual Ratio	10.60%	10.10%
Common equity Tier 1 capital to RWA	$ 151,253	$ 135,613
Total Capital to RWA, Required For Capital Adequacy Purposes Amount	268,894	241,090
Tier 1 (Core) Capital to RWA, Required For Capital Adequacy Purposes Amount	201,670	180,818
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Amount	$ 163,420	$ 167,420
Common equity Tier 1 capital to RWA	4.50%	4.50%
Total Capital to RWA, Required For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 (Core) Capital to RWA, Required For Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Ratio	4.00%	4.00%
Common equity Tier 1 capital to RWA	$ 218,476	$ 195,886
Total Capital to RWA, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	336,117	301,363
Tier 1 (Core) Capital to RWA, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	268,894	241,090
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 204,274	$ 209,275
Common equity Tier 1 capital to RWA	6.50%	6.50%
Total Capital to RWA, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	10.00%	10.00%
Tier 1 (Core) Capital to RWA, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	8.00%	8.00%
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	5.00%	5.00%

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019USD ($)Swap	Dec. 31, 2018USD ($)
Derivative [Line Items]
Number of swap transaction | Swap	16
Derivative liability, notional amount	$ 101,205,000
Derivatives designated as Hedging Instruments [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Derivative liability, Estimated Fair Value		$ 0
Derivatives designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Derivative liability, Estimated Fair Value		$ 0

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Fair Value Hedge Relationships (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative liability, Notional Amount	$ 101,205,000
Derivatives designated as Hedging Instruments [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Derivative liability, Estimated Fair Value		$ 0
Derivatives designated as Hedging Instruments [Member] | Interest Rate Swap Aagreements - Securities [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity (In Years)	7 years 2 months 23 days
Weighted Average Pay Rate	2.527%
Receive Rate	3 month LIBOR
Derivative liability, Notional Amount	$ 101,205,000
Derivatives designated as Hedging Instruments [Member] | Interest Rate Swap Aagreements - Securities [Member] | Fair Value Hedge [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivative liability, Estimated Fair Value	$ 4,733,000

Derivative Instruments - Sche_2

Derivative Instruments - Schedule of Effects of Fair Value Hedge Relationships Reported in Interest Income on Securities on Consolidated Statements of Income (Detail) - Interest Rate Swap Aagreements - Securities [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on fair value hedging relationship - Hedged items	$ 3,615	$ 4,733
Gain (loss) on fair value hedging relationship - Derivative designated as hedging instrument	$ (3,615)	$ (4,733)

Derivative Instruments - Sche_3

Derivative Instruments - Schedule of Amounts Related to Cumulative Basis Adjustments for Fair Value Hedges (Detail) - Securities Available-for-sale [Member] $ in Thousands	Jun. 30, 2019USD ($)
Derivative [Line Items]
Carrying Amount of the Hedged Assets	$ 101,205
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	$ 4,733

Derivative Instruments - Sche_4

Derivative Instruments - Schedule of Cash Flow Hedge Relationships (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative liability, Notional Amount	$ 101,205,000
Derivatives designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Derivative liability, Estimated Fair Value		$ 0
Derivatives designated as Hedging Instruments [Member] | Interest Rate Swap Aagreements [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity (In Years)	2 years
Weighted Average Pay Rate	2.232%
Receive Rate	3 month LIBOR
Derivative liability, Notional Amount	$ 100,000,000
Derivatives designated as Hedging Instruments [Member] | Interest Rate Swap Aagreements [Member] | Cash Flow Hedge [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivative liability, Estimated Fair Value	$ 1,667,000

Derivative Instruments - Sche_5

Derivative Instruments - Schedule of Effects of Cash Flow Hedge Relationships on Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Interest Rate Swap Aagreements [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain Recognized in Other Comprehensive Income (Loss)	$ (1,231)	$ (1,231)

Commitments and Contingencies -

Commitments and Contingencies - Summary of Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Unfunded Loan Commitments [Member]
Financial Instruments With Off Balance Sheet Risk [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 63,707	$ 28,731
Standby Letters of Credit [Member]
Financial Instruments With Off Balance Sheet Risk [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	52,064	40,024
Unused Lines of Credit [Member]
Financial Instruments With Off Balance Sheet Risk [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 801,049	$ 654,584

Fair Value - Additional informa

Fair Value - Additional information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)Loan	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)Loan
Fair Value Measurements Of Financial Instruments [Line Items]
Fair value measurements, valuation techniques			For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2), using matrix pricing. Matrix pricing is a mathematical technique commonly used to price debt securities that are not actively traded and values debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs). Included in securities is interest rate swap agreements. The carrying amount of the interest rate swap agreements is based on pricing models that utilize observable market inputs (Level 2).
Transfers of assets between level 1 and level 2	$ 0		$ 0		$ 0
Transfers of assets between level 2 and level 1	0		0		0
Transfers of liabilities between level 1 and level 2	0		0		0
Transfers of liabilities between level 2 and level	0		0		0
Carrying amount of impaired loans with specific allocations	4,030,000		4,030,000		5,654,000
Additional provision for loan losses	7,031,000	$ 570,000	12,086,000	$ 1,143,000
Foreclosed assets	0		$ 0		$ 0
Fair Value [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Number of Collateral Dependent Impaired Loan | Loan			1		1
Carrying amount of impaired loans with specific allocations	0		$ 0		$ 150,000
Changes Measurement [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Additional provision for loan losses	6,304,000	16,000	9,759,000	16,000
Mortgage Banking Revenue [Member] | Loans Held for Sale [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Unpaid principal balance of loans held for sale	26,118,000		26,118,000		10,722,000
Unrealized gain (loss) on loan held for sale			975,000		$ 381,000
Change in fair value of loans held for sale	$ 324,000	$ 220,000	$ 594,000	$ 194,000
Maximum [Member] | Mortgage Banking Revenue [Member] | Loans Held for Sale [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Term of loan			90 days		90 days

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 715,132	$ 1,030,668
Loans held for sale	27,093	11,103
U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale		253,014
U.S. Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	1,688	21,888
Mortgage-Backed Securities: Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	474,051	580,699
Mortgage-Backed Securities: Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	18,699
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	25,208	24,844
Corporate Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	22,716	12,424
State and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	172,770	137,799
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale		253,014
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	715,132	777,654
Loans held for sale	27,093	11,103
Other assets	278	206
Other liabilities	6,580	129
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale		253,014
Fair Value, Measurements, Recurring [Member] | U.S. Government Sponsored Entities and Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	1,688	21,888
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities: Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	474,051	580,699
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities: Commercial [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	18,699
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	25,208	24,844
Fair Value, Measurements, Recurring [Member] | Corporate Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	22,716	12,424
Fair Value, Measurements, Recurring [Member] | State and Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 172,770	$ 137,799

Fair Value - Carrying Amount an

Fair Value - Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financial assets
Securities available for sale	$ 715,132	$ 1,030,668
Securities held to maturity	120,809	118,955
Loans held for sale	27,093	11,103
Servicing rights, net	3,905	4,836
Reported Value Measurement [Member]
Financial assets
Cash and cash equivalents	150,721	280,212
Certificates of deposit held at other financial institutions	3,840	3,594
Securities available for sale	715,132	1,030,668
Securities held to maturity	118,963	121,617
Loans held for sale	27,093	11,103
Net loans	2,852,990	2,641,948
Servicing rights, net	3,299	3,403
Other assets	278	206
Accrued interest receivable	14,281	13,337
Financial liabilities
Deposits	3,146,645	3,431,807
Federal Home Loan Bank advances	396,500	368,500
Subordinated notes, net	58,782	58,693
Other liabilities	6,580	129
Accrued interest payable	4,312	4,700
Fair Value [Member]
Financial assets
Cash and cash equivalents	150,721	280,212
Certificates of deposit held at other financial institutions	3,840	3,594
Securities available for sale	715,132	1,030,668
Securities held to maturity	120,809	118,955
Loans held for sale	27,093	11,103
Net loans	2,886,557	2,622,386
Servicing rights, net	3,905	4,836
Other assets	278	206
Accrued interest receivable	14,282	13,337
Financial liabilities
Deposits	3,148,116	3,425,277
Federal Home Loan Bank advances	396,624	366,786
Subordinated notes, net	61,438	59,852
Other liabilities	6,580	129
Accrued interest payable	4,312	4,700
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial assets
Cash and cash equivalents	150,721	280,212
Securities available for sale		253,014
Accrued interest receivable	136	71
Financial liabilities
Deposits	2,182,888	2,105,951
Accrued interest payable	179	146
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial assets
Certificates of deposit held at other financial institutions	3,840	3,594
Securities available for sale	715,132	777,654
Securities held to maturity	120,809	118,955
Loans held for sale	27,093	11,103
Other assets	278	206
Accrued interest receivable	5,196	5,539
Financial liabilities
Deposits	965,228	1,319,326
Federal Home Loan Bank advances	396,624	366,786
Other liabilities	6,580	129
Accrued interest payable	687	3,866
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial assets
Net loans	2,886,557	2,622,386
Servicing rights, net	3,905	4,836
Accrued interest receivable	8,950	7,727
Financial liabilities
Subordinated notes, net	61,438	59,852
Accrued interest payable	$ 3,446	$ 688

Earnings Per Share - Computatio

Earnings Per Share - Computation of Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic
Net income available to common shareholders	$ 5,173	$ 10,161	$ 8,075	$ 20,213
Less: earnings allocated to participating securities	(41)	(118)	(79)	(192)
Net income allocated to common shareholders	$ 5,132	$ 10,043	$ 7,996	$ 20,021
Weighted average common shares outstanding including participating securities	14,599,407	14,383,493	14,580,370	13,819,742
Less: Participating securities	(117,063)	(167,381)	(143,043)	(130,898)
Average shares	14,482,344	14,216,112	14,437,327	13,688,844
Basic earnings per common share	$ 0.35	$ 0.71	$ 0.55	$ 1.46
Diluted
Net income allocated to common shareholders	$ 5,132	$ 10,043	$ 7,996	$ 20,021
Weighted average common shares outstanding for basic earnings per common share	14,482,344	14,216,112	14,437,327	13,688,844
Average shares and dilutive potential common shares	14,894,140	14,814,059	14,849,292	14,246,151
Dilutive earnings per common share	$ 0.34	$ 0.68	$ 0.54	$ 1.41
Stock Option [Member]
Diluted
Add: Dilutive effects of assumed exercises of stock options and restricted stock units	341,777	597,947	376,762	557,307
Restricted Stock Units [Member]
Diluted
Add: Dilutive effects of assumed exercises of stock options and restricted stock units	70,019		35,203

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Stock options to purchase shares of the Company's common stock	980,099	659,291	874,279	535,285

Subordinated Debt Issuance - Ad

Subordinated Debt Issuance - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Subordinated notes, net of issuance costs	$ 58,782,000		$ 58,693,000
Amortization of debt issuance costs	89,000	$ 89,000
Subordinated Debt [Member]
Debt Instrument [Line Items]
Notes, Aggregate principal amount	60,000,000
Amortization of debt issuance costs	89,000	$ 89,000
Subordinated Debt [Member] | March 2016 Subordinated Notes [Member]
Debt Instrument [Line Items]
Notes, Aggregate principal amount					$ 40,000,000
Notes, Interest rate					6.875%
Notes, Issuance cost	$ 1,382,000
Term of notes	10 years
Subordinated Debt [Member] | June 2016 Subordinated Notes [Member]
Debt Instrument [Line Items]
Notes, Aggregate principal amount				$ 20,000,000
Notes, Interest rate				7.00%
Notes, Issuance cost	$ 404,000
Term of notes	10 years

Subordinated Debt Issuance - Su

Subordinated Debt Issuance - Summary of Terms of Each Subordinated Note offering (Detail) - Subordinated Debt [Member] - USD ($)	1 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2019
Debt Instrument [Line Items]
Principal amount issued			$ 60,000,000
March 2016 Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal amount issued		$ 40,000,000
Maturity date		Mar. 30, 2026
Initial fixed interest rate		6.875%
Initial interest rate period			10 years
First interest rate change date		Mar. 30, 2021
Interest payment frequency through year five		Semiannually
Interest payment frequency after five years		Quarterly
March 2016 Subordinated Notes [Member] | Initial Term [Member]
Debt Instrument [Line Items]
Initial interest rate period		5 years
March 2016 Subordinated Notes [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest payment frequency through year five		Quarterly
Interest repricing index and margin		3-month LIBOR plus 5.636%
June 2016 Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal amount issued	$ 20,000,000
Maturity date	Jul. 1, 2026
Initial fixed interest rate	7.00%
Initial interest rate period			10 years
First interest rate change date	Jul. 1, 2021
Interest payment frequency through year five	Semiannually
Interest payment frequency after five years	Quarterly
June 2016 Subordinated Notes [Member] | Initial Term [Member]
Debt Instrument [Line Items]
Initial interest rate period	5 years
June 2016 Subordinated Notes [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest payment frequency through year five	Quarterly
Interest repricing index and margin	3-month LIBOR plus 6.04%