Investment Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		$ 48,669
Debt securities, maturing 1 to 5 years, amortized cost		189,056
Debt securities, maturing 5 to 10 years, amortized cost		213,176
Debt securities, maturing over 10 years, amortized cost		841,430
Amortized Cost		1,292,331	$ 1,300,719
Debt securities, maturing within 1 year, fair value		48,135
Debt securities, maturing 1 to 5 years, fair value		176,471
Debt securities, maturing 5 to 10 years, fair value		188,199
Debt securities, maturing over 10 years, fair value		720,634
Debt securities	[1]	$ 1,133,439	1,131,399
Available-for-sale securities, maturing within 1 year, weighted average yield		2.71%
Available-for-sale securities, maturing 1 to 5 years, weighted average yield		2.42%
Available-for-sale securities, maturing 5 to 10 years, weighted average yield		2.16%
Available-for-sale securities, maturing over 10 years, weighted average yield		2.16%
Available-for-sale securities, total weighted average yield		2.22%
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		$ 12,496
Debt securities, maturing 1 to 5 years, amortized cost		51,227
Debt securities, maturing 5 to 10 years, amortized cost		8,855
Debt securities, maturing over 10 years, amortized cost		6,191
Amortized Cost		78,769	158,473
Debt securities, maturing within 1 year, fair value		12,200
Debt securities, maturing 1 to 5 years, fair value		47,897
Debt securities, maturing 5 to 10 years, fair value		8,855
Debt securities, maturing over 10 years, fair value		6,303
Debt securities		75,255	152,422
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		10,082
Debt securities, maturing 1 to 5 years, amortized cost		60,436
Debt securities, maturing 5 to 10 years, amortized cost		32,311
Debt securities, maturing over 10 years, amortized cost		8,241
Amortized Cost		111,070	101,753
Debt securities, maturing within 1 year, fair value		9,950
Debt securities, maturing 1 to 5 years, fair value		54,971
Debt securities, maturing 5 to 10 years, fair value		27,167
Debt securities, maturing over 10 years, fair value		6,236
Debt securities		98,324	88,115
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		24,456
Debt securities, maturing 1 to 5 years, amortized cost		58,633
Debt securities, maturing 5 to 10 years, amortized cost		69,644
Debt securities, maturing over 10 years, amortized cost		127,765
Amortized Cost		280,498	261,612
Debt securities, maturing within 1 year, fair value		24,362
Debt securities, maturing 1 to 5 years, fair value		55,420
Debt securities, maturing 5 to 10 years, fair value		59,159
Debt securities, maturing over 10 years, fair value		109,330
Debt securities		248,271	225,882
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		1
Debt securities, maturing 1 to 5 years, amortized cost		3,157
Debt securities, maturing 5 to 10 years, amortized cost		58,005
Debt securities, maturing over 10 years, amortized cost		676,182
Amortized Cost		737,345	707,025
Debt securities, maturing within 1 year, fair value		1
Debt securities, maturing 1 to 5 years, fair value		2,971
Debt securities, maturing 5 to 10 years, fair value		52,558
Debt securities, maturing over 10 years, fair value		579,957
Debt securities		635,487	604,653
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		1,634
Debt securities, maturing 1 to 5 years, amortized cost		8,428
Debt securities, maturing 5 to 10 years, amortized cost		31,690
Debt securities, maturing over 10 years, amortized cost		21,209
Amortized Cost		62,961	61,091
Debt securities, maturing within 1 year, fair value		1,622
Debt securities, maturing 1 to 5 years, fair value		7,695
Debt securities, maturing 5 to 10 years, fair value		26,547
Debt securities, maturing over 10 years, fair value		16,966
Debt securities		52,830	50,049
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		7,175
Debt securities, maturing 5 to 10 years, amortized cost		12,671
Debt securities, maturing over 10 years, amortized cost		1,842
Amortized Cost		21,688	10,765
Debt securities, maturing within 1 year, fair value		0
Debt securities, maturing 1 to 5 years, fair value		7,517
Debt securities, maturing 5 to 10 years, fair value		13,913
Debt securities, maturing over 10 years, fair value		1,842
Debt securities		$ 23,272	$ 10,278

[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $241, respectively, at June 30, 2023 and December 31, 2022.