Accumulated Other Comprehensive (Loss) Income - Changes in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Equity [Abstract]
Unrealized loss on securities, before tax amount	$ (18,356)	$ (40,361)	$ (39,902)	$ 1,838
Unrealized loss on securities, tax effect	4,157	9,142	9,038	(416)
Unrealized loss on securities, net of tax amount	(14,199)	(31,219)	(30,864)	1,422
Reclassification adjustment for securities gain included in net income, before tax amount	20,282	(4)	20,282	18
Reclassification adjustment for securities gain included in net income, tax effect	(4,594)	1	(4,594)	(4)
Reclassification adjustment for securities gain included in net income, net of tax amount	15,688	(3)	15,688	14
Amortization of net unrealized losses on AFS securities transferred to HTM. before-tax amount	1,815	1,941	3,608	3,851
Amortization of net unrealized losses on AFS securities transferred to HTM, tax	(412)	(440)	(818)	(872)
Amortization of net unrealized losses on AFS securities transferred to HTM, net of tax amount	1,403	1,501	2,790	2,979
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount	2,916	(7,251)	8,472	5,284
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount	(660)	1,665	(1,919)	(17,690)
Amount of Gain (Loss) Recognized in OCI on Derivative	2,256	(5,586)	6,553	(12,406)
Net unrealized losses on interest rate swaps used in cash flow hedges, before-tax amount	5,002	7,032	10,014	14,189
Net unrealized losses on interest rate swaps used in cash flow hedges, tax	(1,111)	(22)	(2,224)	(36)
Net unrealized losses on interest rate swaps used in cash flow hedges, net of tax amount	3,891	7,010	7,790	14,153
Amortization of net unrecognized pension and postretirement items, before tax amount	(136)	4	(271)	36
Amortization of net unrecognized pension and postretirement items, tax effect	31	(1)	60	(8)
Amortization of net unrecognized pension and postretirement items, net of tax amount	(105)	3	(211)	28
Total Other Comprehensive Income, Before Tax Amount	11,523	(38,639)	2,203	25,216
Total Other Comprehensive Income, Tax Effect	(2,589)	10,345	(457)	(19,026)
Other Comprehensive Income (Loss), net of tax	$ 8,934	$ (28,294)	$ 1,746	$ 6,190