Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,101,933	$ 1,126,144
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(98,436)	(123,603)
Fair Value	1,003,497	1,002,544
Allowance for credit losses - held to maturity securities	(32)	(32)
Held to maturity securities, net of allowance for credit losses	1,101,901	1,126,112
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	283,632	284,542
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(41,658)	(42,491)
Fair Value	241,974	242,054
Residential mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	347,015	354,882
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,960)	(41,506)
Fair Value	320,055	313,376
Residential mortgage backed securities: | Government agency mortgage backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	360,229	372,414
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17,581)	(25,251)
Fair Value	342,648	347,163
Commercial mortgage backed securities: | Government agency mortgage backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	16,955	16,961
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,565)	(2,958)
Fair Value	14,390	14,003
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	43,298	43,662
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6,606)	(7,317)
Fair Value	36,692	36,345
Other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	50,804	53,683
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,066)	(4,080)
Fair Value	$ 47,738	$ 49,603