Investment Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		$ 38,168
Debt securities, maturing 1 to 5 years, amortized cost		261,168
Debt securities, maturing 5 to 10 years, amortized cost		225,113
Debt securities, maturing over 10 years, amortized cost		865,172
Amortized Cost		1,389,621	$ 1,283,146
Debt securities, maturing within 1 year, fair value		38,090
Debt securities, maturing 1 to 5 years, fair value		254,985
Debt securities, maturing 5 to 10 years, fair value		204,271
Debt securities, maturing over 10 years, fair value		770,252
Debt securities	[1]	$ 1,267,598	1,275,493
Available-for-sale securities, maturing within 1 year, weighted average yield		3.70%
Available-for-sale securities, maturing 1 to 5 years, weighted average yield		2.18%
Available-for-sale securities, maturing 5 to 10 years, weighted average yield		1.60%
Available-for-sale securities, maturing over 10 years, weighted average yield		1.96%
Available-for-sale securities, total weighted average yield		1.99%
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		$ 10,071
Debt securities, maturing 1 to 5 years, amortized cost		169,024
Debt securities, maturing 5 to 10 years, amortized cost		0
Debt securities, maturing over 10 years, amortized cost		0
Amortized Cost		179,095	35,609
Debt securities, maturing within 1 year, fair value		9,972
Debt securities, maturing 1 to 5 years, fair value		165,283
Debt securities, maturing 5 to 10 years, fair value		0
Debt securities, maturing over 10 years, fair value		0
Debt securities		175,255	35,604
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		2,807
Debt securities, maturing 1 to 5 years, amortized cost		29,294
Debt securities, maturing 5 to 10 years, amortized cost		51,848
Debt securities, maturing over 10 years, amortized cost		8,296
Amortized Cost		92,245	83,019
Debt securities, maturing within 1 year, fair value		2,802
Debt securities, maturing 1 to 5 years, fair value		27,614
Debt securities, maturing 5 to 10 years, fair value		45,391
Debt securities, maturing over 10 years, fair value		6,658
Debt securities		82,465	81,739
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		19,729
Debt securities, maturing 1 to 5 years, amortized cost		55,670
Debt securities, maturing 5 to 10 years, amortized cost		69,708
Debt securities, maturing over 10 years, amortized cost		133,460
Amortized Cost		278,567	259,508
Debt securities, maturing within 1 year, fair value		19,757
Debt securities, maturing 1 to 5 years, fair value		54,919
Debt securities, maturing 5 to 10 years, fair value		63,328
Debt securities, maturing over 10 years, fair value		111,398
Debt securities		249,402	259,319
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		30
Debt securities, maturing 1 to 5 years, amortized cost		2,033
Debt securities, maturing 5 to 10 years, amortized cost		62,316
Debt securities, maturing over 10 years, amortized cost		698,132
Amortized Cost		762,511	833,328
Debt securities, maturing within 1 year, fair value		30
Debt securities, maturing 1 to 5 years, fair value		1,999
Debt securities, maturing 5 to 10 years, fair value		58,905
Debt securities, maturing over 10 years, fair value		630,801
Debt securities		691,735	828,517
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost		5,531
Debt securities, maturing 1 to 5 years, amortized cost		909
Debt securities, maturing 5 to 10 years, amortized cost		34,741
Debt securities, maturing over 10 years, amortized cost		25,284
Amortized Cost		66,465	64,971
Debt securities, maturing within 1 year, fair value		5,529
Debt securities, maturing 1 to 5 years, fair value		876
Debt securities, maturing 5 to 10 years, fair value		30,501
Debt securities, maturing over 10 years, fair value		21,395
Debt securities		58,301	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		4,238
Debt securities, maturing 5 to 10 years, amortized cost		6,500
Debt securities, maturing over 10 years, amortized cost		0
Amortized Cost		10,738	6,711
Debt securities, maturing within 1 year, fair value		0
Debt securities, maturing 1 to 5 years, fair value		4,294
Debt securities, maturing 5 to 10 years, fair value		6,146
Debt securities, maturing over 10 years, fair value		0
Debt securities		$ 10,440	$ 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 $286, respectively, at June 30, 2022 and $0 and $286, respectively, at December 31, 2021.