Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,174,695	$ 1,221,496
Gross Unrealized Gains	21	74
Gross Unrealized Losses	(122,011)	(99,740)
Fair Value	1,052,705	1,121,830
Allowance for credit losses - held to maturity securities	(32)	(32)
Held to maturity securities, net of allowance for credit losses	1,174,663	1,221,464
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	286,354	288,154
Gross Unrealized Gains	21	74
Gross Unrealized Losses	(41,326)	(33,688)
Fair Value	245,049	254,540
Residential mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	371,232	387,208
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(38,017)	(31,670)
Fair Value	333,215	355,538
Residential mortgage backed securities: | Government agency mortgage backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	399,822	426,264
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(27,382)	(20,314)
Fair Value	372,440	405,950
Commercial mortgage backed securities: | Government agency mortgage backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	16,972	16,983
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,058)	(2,972)
Fair Value	13,914	14,011
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	44,191	44,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,521)	(6,977)
Fair Value	36,670	37,537
Other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	56,124	58,373
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,707)	(4,119)
Fair Value	$ 51,417	$ 54,254