Investment Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		$ 86,001
Debt securities, maturing 1 to 5 years, amortized cost		211,678
Debt securities, maturing 5 to 10 years, amortized cost		228,787
Debt securities, maturing over 10 years, amortized cost		823,334
Amortized Cost		1,349,800	$ 1,283,146
Debt securities, maturing within 1 year, fair value		84,796
Debt securities, maturing 1 to 5 years, fair value		201,115
Debt securities, maturing 5 to 10 years, fair value		195,760
Debt securities, maturing over 10 years, fair value		688,173
Debt securities	[1]	$ 1,169,844	1,275,493
Available-for-sale securities, maturing within 1 year, weighted average yield		2.52%
Available-for-sale securities, maturing 1 to 5 years, weighted average yield		2.78%
Available-for-sale securities, maturing 5 to 10 years, weighted average yield		2.29%
Available-for-sale securities, maturing over 10 years, weighted average yield		1.81%
Available-for-sale securities, total weighted average yield		2.09%
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		$ 50,639
Debt securities, maturing 1 to 5 years, amortized cost		128,185
Debt securities, maturing 5 to 10 years, amortized cost		0
Debt securities, maturing over 10 years, amortized cost		0
Amortized Cost		178,824	35,609
Debt securities, maturing within 1 year, fair value		49,673
Debt securities, maturing 1 to 5 years, fair value		122,382
Debt securities, maturing 5 to 10 years, fair value		0
Debt securities, maturing over 10 years, fair value		0
Debt securities		172,055	35,604
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		4,542
Debt securities, maturing 1 to 5 years, amortized cost		29,812
Debt securities, maturing 5 to 10 years, amortized cost		51,880
Debt securities, maturing over 10 years, amortized cost		8,283
Amortized Cost		94,517	83,019
Debt securities, maturing within 1 year, fair value		4,499
Debt securities, maturing 1 to 5 years, fair value		27,373
Debt securities, maturing 5 to 10 years, fair value		42,907
Debt securities, maturing over 10 years, fair value		6,136
Debt securities		80,915	81,739
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		27,288
Debt securities, maturing 1 to 5 years, amortized cost		46,871
Debt securities, maturing 5 to 10 years, amortized cost		76,138
Debt securities, maturing over 10 years, amortized cost		120,464
Amortized Cost		270,761	259,508
Debt securities, maturing within 1 year, fair value		27,100
Debt securities, maturing 1 to 5 years, fair value		44,620
Debt securities, maturing 5 to 10 years, fair value		64,592
Debt securities, maturing over 10 years, fair value		93,710
Debt securities		230,022	259,319
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		23
Debt securities, maturing 1 to 5 years, amortized cost		1,657
Debt securities, maturing 5 to 10 years, amortized cost		60,007
Debt securities, maturing over 10 years, amortized cost		669,438
Amortized Cost		731,125	833,328
Debt securities, maturing within 1 year, fair value		23
Debt securities, maturing 1 to 5 years, fair value		1,599
Debt securities, maturing 5 to 10 years, fair value		53,896
Debt securities, maturing over 10 years, fair value		568,543
Debt securities		624,061	828,517
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		3,509
Debt securities, maturing 1 to 5 years, amortized cost		901
Debt securities, maturing 5 to 10 years, amortized cost		34,262
Debt securities, maturing over 10 years, amortized cost		25,149
Amortized Cost		63,821	64,971
Debt securities, maturing within 1 year, fair value		3,501
Debt securities, maturing 1 to 5 years, fair value		857
Debt securities, maturing 5 to 10 years, fair value		28,362
Debt securities, maturing over 10 years, fair value		19,784
Debt securities		52,504	63,519
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		0
Debt securities, maturing 1 to 5 years, amortized cost		4,252
Debt securities, maturing 5 to 10 years, amortized cost		6,500
Debt securities, maturing over 10 years, amortized cost		0
Amortized Cost		10,752	6,711
Debt securities, maturing within 1 year, fair value		0
Debt securities, maturing 1 to 5 years, fair value		4,284
Debt securities, maturing 5 to 10 years, fair value		6,003
Debt securities, maturing over 10 years, fair value		0
Debt securities		$ 10,287	$ 6,795

[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $238, respectively, at September 30, 2022 and $0 and $286, respectively, at December 31, 2021.