Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2018	$ 315	$ 222,720	$ (75,146)	$ 414,327	$ (12,752)	$ 549,464
Impact of Adoption of Accounting Standards Update	0	0	0	2,716	0	2,716
Net income	0	0	0	41,279	0	41,279
Award of common shares released from Employee Benefit Trust	0	2,307	0	0	0	2,307
Vesting of restricted stock unit awards	0	(6,099)	6,309	(210)	0	0
Exercise of stock options	0	0	6	(3)	0	3
Stock-based compensation expense	0	7,763	0	0	0	7,763
Purchase of treasury shares	0	0	(771)	0	0	(771)
Repurchase of shares to satisfy tax obligation	0	0	(1,885)	0	0	(1,885)
Dividends on common stock	0	0	0	(24,149)	0	(24,149)
Other comprehensive income (loss), net of tax	0	0	0	0	2,945	2,945
Balance at Dec. 31, 2019	315	226,691	(71,487)	433,960	(9,807)	579,672
Impact of adoption of ASC 326 - Credit Losses	0	0	0	(875)	0	(875)
Net income	0	0	0	34,674	0	34,674
Shares issued in acquisition of Empire Bancorp, Inc.	26	32,679	0	0	0	32,705
Award of common shares released from Employee Benefit Trust	0	1,520	0	0	0	1,520
Vesting of restricted stock unit awards	0	(5,807)	5,964	(157)	0
Stock-based compensation expense	0	6,450	0	0	0	6,450
Purchase of treasury shares	0	0	(2,342)	0	0	(2,342)
Repurchase of shares to satisfy tax obligation	0	0	(1,535)	0	0	(1,535)
Dividends on common stock	0	0	0	(24,813)	0	(24,813)
Other comprehensive income (loss), net of tax	0	0	0	0	(6,459)	(6,459)
Balance at Dec. 31, 2020	341	261,533	(69,400)	442,789	(16,266)	618,997
Net income	0	0	0	81,793	0	81,793
Award of common shares released from Employee Benefit Trust	0	321	0	0	0	321
Vesting of restricted stock unit awards	0	(5,308)	5,477	(169)	0
Stock-based compensation expense	0	6,829	0	0	0	6,829
Purchase of treasury shares	0	0	(9,988)	0	0	(9,988)
Repurchase of shares to satisfy tax obligation	0	0	(1,382)	0	0	(1,382)
Dividends on common stock	0	0	0	(26,524)	0	(26,524)
Other comprehensive income (loss), net of tax	0	0	0	0	9,582	9,582
Balance at Dec. 31, 2021	$ 341	$ 263,375	$ (75,293)	$ 497,889	$ (6,684)	$ 679,628