Allowance for Credit Losses - Activity in ACL by Class of Loans and Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	$ 159,836	$ 147,122	$ 156,533	$ 143,900	$ 143,900
Charge-offs	(4,859)	(5,650)	(10,622)	(11,480)
Recoveries	2,340	2,109	4,314	4,725
Provision	3,200	5,000	10,292	11,436
Balance at end of year	160,517	148,581	160,517	148,581	156,533
Commercial Portfolio Segment [Member]
Rollforward of the Allowance for Credit Losses
Charge-offs			(1,586)		(5,982)
Commercial and Industrial
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	17,087	14,038	14,956	14,564	14,564
Charge-offs	(677)	(997)	(1,586)	(1,788)	(3,482)
Recoveries	250	292	461	538
Provision	(1,947)	477	882	496
Balance at end of year	14,713	13,810	14,713	13,810	14,956
Commercial Real Estate Portfolio Segment [Member]
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	43,526	40,311	43,944	43,810	43,810
Charge-offs					(2,500)
Provision	886	(424)	468	(3,923)
Balance at end of year	44,412	39,887	44,412	39,887	43,944
Construction
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	12,441	6,473	10,392	5,843	5,843
Provision	(3,110)	3,398	(1,061)	4,028
Balance at end of year	9,331	9,871	9,331	9,871	10,392
Finance Leases Portfolio Segment [Member]
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	2,485	1,481	1,754	1,551	1,551
Provision	(133)	(34)	598	(104)
Balance at end of year	2,352	1,447	2,352	1,447	1,754
Residential mortgage
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	36,790	34,320	36,880	35,175	35,175
Charge-offs				(122)	(414)
Recoveries	28	30	58	57
Provision	9,334	(1,547)	9,214	(2,307)
Balance at end of year	46,152	32,803	46,152	32,803	36,880
Residential mortgage | Residential Lending: Home Equity Line
Rollforward of the Allowance for Credit Losses
Charge-offs					(292)
Residential Lending: Home Equity Line
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	11,447	9,341	11,728	8,296	8,296
Charge-offs		(137)		(272)
Recoveries	112	59	156	236
Provision	(2,376)	2,543	(2,701)	3,546
Balance at end of year	9,183	11,806	9,183	11,806	11,728
Consumer
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	36,060	41,158	36,879	34,661	34,661
Charge-offs	(4,182)	(4,516)	(9,036)	(9,298)	(17,110)
Recoveries	1,950	1,728	3,639	3,894
Provision	546	587	2,892	9,700
Balance at end of year	$ 34,374	$ 38,957	$ 34,374	$ 38,957	$ 36,879