Parent-only Financial Information - Statement of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income:
Loans receivable	$ 263,559	$ 228,841	$ 255,236
Unrealized (loss) gain on debt securities available for sale	(137,255)	(30,979)	21,236
Interest expense on borrowings	15,015	7,907	18,892
Net interest income	266,777	233,134	221,573
Non-interest income:
Gain on securities transactions	210	2,025	370
Gain on sale of loans	178	10,790	5,444
Other non-interest income	10,380	8,940	6,983
Total non-interest income (loss)	30,400	38,831	31,270
Non-interest expense:
Merger-related expenses	2,810	822	1,931
Other non-interest expense	5,515	8,867	14,556
Total non-interest expense	174,816	155,737	158,139
Income before income tax expense	116,876	126,181	76,257
Income tax expense	30,703	34,132	18,654
Net income	86,173	92,049	57,603
Other comprehensive income (loss)	(133,377)	23,706	(890)
Total comprehensive income (loss), net of tax	(47,204)	115,755	56,713
Parent Company
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiary	80,000	65,000	50,000
Interest income:
Loans receivable	1,893	1,969	2,047
Unrealized (loss) gain on debt securities available for sale	10	43	51
Interest-earning deposits	7	0	1
Total interest income	81,910	67,012	52,099
Interest expense on borrowings	1,600	427	863
Net interest income	80,310	66,585	51,236
Equity earnings (loss) in subsidiaries	9,132	27,652	8,027
Non-interest income:
Gain on securities transactions	0	383	2
Gain on sale of loans	(15)	(35)	(115)
Other non-interest income	650	0	0
Total non-interest income (loss)	635	348	(113)
Non-interest expense:
Merger-related expenses	522	546	280
Other non-interest expense	2,861	2,203	1,377
Total non-interest expense	3,383	2,749	1,657
Income before income tax expense	86,694	91,836	57,493
Income tax expense	521	(213)	(110)
Net income	86,173	92,049	57,603
Other comprehensive income (loss)	(133,377)	23,706	(890)
Total comprehensive income (loss), net of tax	$ (47,204)	$ 115,755	$ 56,713