Investment Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		$ 88,580
Amortized cost of securities maturing in 1-5 years		205,258
Amortized cost of securities maturing in 5-10 years		209,989
Amortized cost of securities maturing in over 10 years		796,892
Amortized cost		1,300,719	$ 1,283,146
Fair value of securities maturing within 1 year		87,300
Fair value of securities maturing in 1-5 years		193,848
Fair value of securities maturing in 5-10 years		179,505
Fair value of securities maturing in over 10 years		670,746
Debt securities	[1]	$ 1,131,399	1,275,493
Average yield of securities maturing within 1 year		2.32%
Average yield of securities maturing in 1-5 years		2.07%
Average yield of securities maturing in 5-10 years		1.71%
Average yield of securities maturing in over 10 years		1.82%
Available-for-sale securities, total weighted average yield		1.88%
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		$ 53,010
Amortized cost of securities maturing in 1-5 years		105,463
Amortized cost of securities maturing in 5-10 years		0
Amortized cost of securities maturing in over 10 years		0
Amortized cost		158,473	35,609
Fair value of securities maturing within 1 year		51,957
Fair value of securities maturing in 1-5 years		100,465
Fair value of securities maturing in 5-10 years		0
Fair value of securities maturing in over 10 years		0
Debt securities		152,422	35,604
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		7,028
Amortized cost of securities maturing in 1-5 years		41,440
Amortized cost of securities maturing in 5-10 years		45,016
Amortized cost of securities maturing in over 10 years		8,269
Amortized cost		101,753	83,019
Fair value of securities maturing within 1 year		6,933
Fair value of securities maturing in 1-5 years		37,643
Fair value of securities maturing in 5-10 years		37,513
Fair value of securities maturing in over 10 years		6,026
Debt securities		88,115	81,739
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		27,434
Amortized cost of securities maturing in 1-5 years		48,406
Amortized cost of securities maturing in 5-10 years		69,824
Amortized cost of securities maturing in over 10 years		115,948
Amortized cost		261,612	259,508
Fair value of securities maturing within 1 year		27,312
Fair value of securities maturing in 1-5 years		46,152
Fair value of securities maturing in 5-10 years		58,275
Fair value of securities maturing in over 10 years		94,143
Debt securities		225,882	259,319
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		18
Amortized cost of securities maturing in 1-5 years		1,595
Amortized cost of securities maturing in 5-10 years		57,748
Amortized cost of securities maturing in over 10 years		647,664
Amortized cost		707,025	833,328
Fair value of securities maturing within 1 year		18
Fair value of securities maturing in 1-5 years		1,524
Fair value of securities maturing in 5-10 years		52,232
Fair value of securities maturing in over 10 years		550,879
Debt securities		604,653	828,517
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		1,090
Amortized cost of securities maturing in 1-5 years		4,089
Amortized cost of securities maturing in 5-10 years		30,901
Amortized cost of securities maturing in over 10 years		25,011
Amortized cost		61,091	64,971
Fair value of securities maturing within 1 year		1,080
Fair value of securities maturing in 1-5 years		3,751
Fair value of securities maturing in 5-10 years		25,520
Fair value of securities maturing in over 10 years		19,698
Debt securities		50,049	63,519
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year		0
Amortized cost of securities maturing in 1-5 years		4,265
Amortized cost of securities maturing in 5-10 years		6,500
Amortized cost of securities maturing in over 10 years		0
Amortized cost		10,765	6,711
Fair value of securities maturing within 1 year		0
Fair value of securities maturing in 1-5 years		4,313
Fair value of securities maturing in 5-10 years		5,965
Fair value of securities maturing in over 10 years		0
Debt securities		$ 10,278	$ 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 $241, respectively, as of December 31, 2022 and $0 and $286, respectively, at December 31, 2021.