Parent Company Only Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 76,945	$ 81,793	$ 34,674
Deferred income tax provision (benefit)	144	(1,725)	(4,637)
Net (gain) loss from fair value adjustments	(5,728)	12,995	2,142
Stock-based compensation expense	6,807	6,829	6,450
Net cash provided by operating activities	85,755	88,598	71,278
Cash used in acquisition of Empire	0	0	(54,836)
Cash provided by acquisition of Empire	0	0	86,340
Net cash (used in) provided by investing activities	(351,818)	(106,783)	93,098
Proceeds from long-term borrowing	63,603	122,843	215,378
Repayment of long-term borrowings	(55,685)	(341,643)	(451,999)
Purchase of treasury stock	(29,675)	(11,370)	(3,877)
Net cash provided by (used in) financing activities	336,094	(57,480)	(56,775)
Net increase (decrease) in cash and cash equivalents, and restricted cash	70,031	(75,665)	107,601
Cash, cash equivalents, and restricted cash, beginning of period	81,723	157,388	49,787
Cash, cash equivalents, and restricted cash, end of period	151,754	81,723	157,388
Holding Company
Net income	76,945	81,793	34,674
(Equity) deficit in undistributed earnings of the Bank	(26,002)	(92,908)	36,981
Deferred income tax provision (benefit)	2,111	(3,939)	(291)
Net (gain) loss from fair value adjustments	(7,207)	13,604	85
Stock-based compensation expense	6,807	6,829	6,450
Net change in operating assets and liabilities	(2,866)	2,927	3,490
Net cash provided by operating activities	49,788	8,306	81,389
Investment in Bank	(50,000)	(15,000)	0
Cash used in acquisition of Empire	0	0	(54,836)
Cash provided by acquisition of Empire	0	0	15,769
Net cash (used in) provided by investing activities	(50,000)	(15,000)	(39,067)
Proceeds from long-term borrowing	63,603	122,843	0
Repayment of long-term borrowings	0	(90,250)	0
Purchase of treasury stock	(29,675)	(11,370)	(3,877)
Cash dividends paid	(27,031)	(26,524)	(24,813)
Net cash provided by (used in) financing activities	6,897	(5,301)	(28,690)
Net increase (decrease) in cash and cash equivalents, and restricted cash	6,685	(11,995)	13,632
Cash, cash equivalents, and restricted cash, beginning of period	16,038	28,033	14,401
Cash, cash equivalents, and restricted cash, end of period	$ 22,723	$ 16,038	$ 28,033