Parent Company Only Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 81,793	$ 34,674	$ 41,279
Deferred income tax	(1,725)	(4,637)	(3,895)
Fair value adjustments for financial assets and financial liabilities	12,995	2,142	5,353
Stock-based compensation expense	6,829	6,450	7,763
Net cash provided by operating activities	88,598	71,278	63,770
Cash used in acquisition of Empire	0	(54,836)	0
Cash provided by acquisition of Empire	0	86,340	0
Net cash (used in) provided by investing activities	(106,783)	93,098	(194,769)
Proceeds from long-term borrowings	122,843	215,378	225,000
Repayment of long-term borrowings	(341,643)	(451,999)	(257,102)
Purchase of treasury stock	(11,370)	(3,877)	(2,656)
Stock options exercised			3
Net cash (used in) provided by financing activities	(57,480)	(56,775)	62,225
Net (decrease) increase in cash and cash equivalents	(75,665)	107,601	(68,774)
Cash and cash equivalents, beginning of year	157,388	49,787	118,561
Cash and cash equivalents, end of year	81,723	157,388	49,787
Holding Company
Net income	81,793	34,674	41,279
Equity in undistributed earnings of the Bank	(92,908)	36,981	(18,091)
Deferred income tax	(3,939)	(291)	(769)
Fair value adjustments for financial assets and financial liabilities	13,604	85	2,725
Stock-based compensation expense	6,829	6,450	7,763
Net change in operating assets and liabilities	2,927	3,490	3,945
Net cash provided by operating activities	8,306	81,389	36,852
Investment in Bank	(15,000)	0	0
Cash used in acquisition of Empire	0	(54,836)	0
Cash provided by acquisition of Empire	0	15,769	0
Net cash (used in) provided by investing activities	(15,000)	(39,067)	0
Proceeds from long-term borrowings	122,843	0	0
Repayment of long-term borrowings	(90,250)	0	0
Purchase of treasury stock	(11,370)	(3,877)	(2,656)
Cash dividends paid	(26,524)	(24,813)	(24,149)
Stock options exercised	0	0	3
Net cash (used in) provided by financing activities	(5,301)	(28,690)	(26,802)
Net (decrease) increase in cash and cash equivalents	(11,995)	13,632	10,050
Cash and cash equivalents, beginning of year	28,033	14,401	4,351
Cash and cash equivalents, end of year	$ 16,038	$ 28,033	$ 14,401