Securities - Amortized Cost and Fair Value, Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Amortized Cost	$ 1,062,649	$ 1,735,000
Gross Unrealized Gains	424	241
Gross Unrealized Losses	(139,794)	(201,299)
Fair Value	923,279	1,533,942
Obligations of other U.S. Government agencies and corporations
Cash and Cash Equivalents [Line Items]
Amortized Cost		170,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(5,340)
Fair Value		164,660
Obligations of states and political subdivisions
Cash and Cash Equivalents [Line Items]
Amortized Cost	36,374	154,066
Gross Unrealized Gains	119	204
Gross Unrealized Losses	(1,883)	(9,368)
Fair Value	34,610	144,902
Other debt securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	72,383	74,885
Gross Unrealized Gains	109	0
Gross Unrealized Losses	(4,458)	(4,049)
Fair Value	68,034	70,836
Government agency mortgage-backed securities | Residential mortgage-backed securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	301,400	508,415
Gross Unrealized Gains	172	37
Gross Unrealized Losses	(24,968)	(52,036)
Fair Value	276,604	456,416
Government agency mortgage-backed securities | Commercial mortgage-backed securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	6,029	11,166
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(637)	(1,053)
Fair Value	5,392	10,113
Government agency collateralized mortgage obligations | Residential mortgage-backed securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	485,164	605,033
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(85,883)	(103,864)
Fair Value	399,281	501,169
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	161,299	211,435
Gross Unrealized Gains	24	0
Gross Unrealized Losses	(21,965)	(25,589)
Fair Value	$ 139,358	$ 185,846