Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 487,226	$ 416,389
Gross Unrealized Gains	0	334
Gross Unrealized Losses	(37,685)	(1,171)
Fair Value	449,541	415,552
Allowance for credit losses - held to maturity securities	(32)	(32)
Held to maturity securities, net of allowance for credit losses	487,194	416,357
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	290,588	267,641
Gross Unrealized Gains	0	333
Gross Unrealized Losses	(26,969)	(685)
Fair Value	263,619	267,289
Residential mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	23,403	24,832
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,904)	(92)
Fair Value	21,499	24,740
Other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	21,938	22,049
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,120)	(79)
Fair Value	20,818	21,970
Government agency mortgage backed securities | Residential mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	95,369	60,507
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(3,943)	(198)
Fair Value	91,426	60,310
Government agency mortgage backed securities | Commercial mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	17,022	1,855
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,488)	0
Fair Value	15,534	1,855
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	38,906	39,505
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,261)	(117)
Fair Value	$ 36,645	$ 39,388