CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Common Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other Comprehensive (Loss) Income (Net of Taxes) Available for Sale Securities	Accumulated Other Comprehensive (Loss) Income (Net of Taxes) Available for Sale Securities Cumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other Comprehensive (Loss) Income (Net of Taxes) Cash Flow Hedge
Beginning balance (shares) at Dec. 31, 2018				56,379,066
Beginning balance at Dec. 31, 2018	$ 581,145	$ 0		$ 456,378	$ 129,806	$ (399)		$ (4,935)	$ 399		$ (104)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,668				23,668
Other comprehensive income	5,768							5,664			104
Issuance of restricted stock awards (in shares)				321,784
Settled restricted stock units (in shares)				121,979
Shares withheld to pay taxes on stock based compensation (in shares)				(44,641)
Shares withheld to pay taxes on stock based compensation	(437)			$ (437)
Restricted stock forfeitures (in shares)				(35,996)
Restricted stock forfeitures	(121)			$ (131)	10
Stock based compensation expense	1,645			$ 1,645
Shares repurchased (in shares)				(759,701)
Shares repurchased	(7,630)			$ (7,630)
Cash dividends	(6,571)				(6,571)
Ending balance (shares) at Jun. 30, 2019				55,982,491
Ending balance at Jun. 30, 2019	$ 597,467			$ 449,825	146,514			1,128			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Beginning balance (shares) at Mar. 31, 2019				56,351,781
Beginning balance at Mar. 31, 2019	$ 588,298			$ 452,931	138,123			(2,756)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,658				11,658
Other comprehensive income	3,884							3,884
Issuance of restricted stock awards (in shares)				24,121
Settled restricted stock units (in shares)				9,677
Shares withheld to pay taxes on stock based compensation (in shares)				(3,119)
Shares withheld to pay taxes on stock based compensation	(33)			$ (33)
Restricted stock forfeitures (in shares)				(33,268)
Restricted stock forfeitures	(120)			$ (129)	9
Stock based compensation expense	805			$ 805
Shares repurchased (in shares)				(366,701)
Shares repurchased	(3,749)			$ (3,749)
Cash dividends	(3,276)				(3,276)
Ending balance (shares) at Jun. 30, 2019				55,982,491
Ending balance at Jun. 30, 2019	597,467			$ 449,825	146,514			1,128			0
Beginning balance (shares) at Dec. 31, 2019				55,999,754
Beginning balance at Dec. 31, 2019	614,464			$ 447,784	165,236			1,444			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,894				16,894
Other comprehensive income	5,122							5,122
Issuance of restricted stock awards (in shares)				250,118
Settled restricted stock units (in shares)				70,220
Shares withheld to pay taxes on stock based compensation (in shares)				(56,564)
Shares withheld to pay taxes on stock based compensation	(591)			$ (591)
Restricted stock forfeitures (in shares)				(28,824)
Restricted stock forfeitures	(17)			$ (25)	8
Stock based compensation expense	1,810			$ 1,810
Shares repurchased (in shares)				(3,851,809)
Shares repurchased	(34,714)			$ (34,714)
Cash dividends	(6,286)				(6,286)
Ending balance (shares) at Jun. 30, 2020				52,382,895
Ending balance at Jun. 30, 2020	596,682			$ 414,264	175,852			6,566			0
Beginning balance (shares) at Mar. 31, 2020				54,286,465
Beginning balance at Mar. 31, 2020	603,340			$ 431,578	169,572			2,190
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,318				9,318
Other comprehensive income	4,376							4,376
Shares withheld to pay taxes on stock based compensation (in shares)				(2,740)
Shares withheld to pay taxes on stock based compensation	(28)			$ (28)
Restricted stock forfeitures (in shares)				(11,416)
Restricted stock forfeitures	(15)			$ (17)	2
Stock based compensation expense	899			$ 899
Shares repurchased (in shares)				(1,889,414)
Shares repurchased	(18,168)			$ (18,168)
Cash dividends	(3,040)				(3,040)
Ending balance (shares) at Jun. 30, 2020				52,382,895
Ending balance at Jun. 30, 2020	$ 596,682			$ 414,264	$ 175,852			$ 6,566			$ 0

[1] Represents the impact of adopting Accounting Standards Update ("ASU") 2016-01. See Note 3 to the unaudited consolidated financial statements for further information.