Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	$ 4,965
Due after one year through five years	216,587
Due after five years through ten years	526,779
Due after ten years	1,950,924
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	2,699,255
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	4,968
Due after one year through five years	204,942
Due after five years through ten years	458,136
Due after ten years	1,678,818
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	2,346,864
Residential Mortgage Backed Securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	1,388,801
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	1,388,801
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	1,187,609
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	1,187,609
US Treasury Securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	4,965
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	4,965
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	4,968
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	4,968
Commercial Mortgage Backed Securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	165,420
Due after five years through ten years	85,712
Due after ten years	17,507
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	268,639
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	157,087
Due after five years through ten years	79,600
Due after ten years	16,619
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	253,306
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	36,183
Due after five years through ten years	15,135
Due after ten years	269,666
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	320,984
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	33,480
Due after five years through ten years	13,912
Due after ten years	236,942
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	284,334
US States and Political Subdivisions Debt Securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	7,341
Due after five years through ten years	21,851
Due after ten years	0
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	29,192
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	6,991
Due after five years through ten years	21,092
Due after ten years	0
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	28,083
Corporate Debt Securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	5,000
Due after five years through ten years	322,426
Due after ten years	0
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	327,426
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	4,850
Due after five years through ten years	262,382
Due after ten years	0
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	267,232
Private Label Collateralized Mortgage Obligations [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	193,071
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	193,071
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	158,412
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	158,412
Collateralized Loan Obligations [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	80,330
Due after ten years	28,838
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	109,168
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	79,867
Due after ten years	28,549
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	108,416
Mortgage-backed Securities, Issued by Private Enterprises
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	1,325
Due after ten years	20,801
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	22,126
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	1,283
Due after ten years	19,530
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	20,813
Asset-backed Securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	20,241
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	20,241
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	19,952
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	19,952
SBA asset-backed securities [Member]
Investment Securities, Available-for-Sale, Amortized Cost
Due in one year or less	0
Due after one year through five years	2,643
Due after five years through ten years	0
Due after ten years	11,999
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total	14,642
Investment Securities, Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	2,534
Due after five years through ten years	0
Due after ten years	11,205
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total	$ 13,739