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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	$ 166,612	$ 159,836	$ 160,393	$ 156,533	$ 156,533
Charge-offs	(5,329)	(4,859)	(11,827)	(10,622)
Recoveries	2,042	2,340	4,759	4,314
Provision	4,500	3,200	14,500	10,292
Balance at end of year	167,825	160,517	167,825	160,517	160,393
Commercial Lending
Rollforward of the Allowance for Credit Losses
Charge-offs			(2,229)		(4,015)
Commercial and Industrial
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	17,992	17,087	16,332	14,956	14,956
Charge-offs	(688)	(677)	(2,147)	(1,586)	(3,615)
Recoveries	196	250	599	461
Provision	2,561	(1,947)	5,277	882
Balance at end of year	20,061	14,713	20,061	14,713	16,332
Commercial Real Estate
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	39,370	43,526	40,624	43,944	43,944
Charge-offs					(400)
Recoveries			251
Provision	(106)	886	(1,611)	468
Balance at end of year	39,264	44,412	39,264	44,412	40,624
Construction
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	9,511	12,441	8,570	10,392	10,392
Provision	(566)	(3,110)	375	(1,061)
Balance at end of year	8,945	9,331	8,945	9,331	8,570
Lease financing
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	2,344	2,485	2,269	1,754	1,754
Charge-offs	(82)		(82)
Provision	81	(133)	156	598
Balance at end of year	2,343	2,352	2,343	2,352	2,269
Residential mortgage
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	34,374	36,790	39,230	36,880	36,880
Charge-offs			(30)
Recoveries	109	28	129	58
Provision	3,482	9,334	(1,394)	9,214
Balance at end of year	37,965	46,152	37,965	46,152	39,230
Residential mortgage | Home Equity Line
Rollforward of the Allowance for Credit Losses
Charge-offs			(30)
Home Equity Line
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	10,270	11,447	10,205	11,728	11,728
Charge-offs	(16)		(30)
Recoveries	32	112	96	156
Provision	904	(2,376)	919	(2,701)
Balance at end of year	11,190	9,183	11,190	9,183	10,205
Consumer
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	52,751	36,060	43,163	36,879	36,879
Charge-offs	(4,543)	(4,182)	(9,568)	(9,036)	(18,002)
Recoveries	1,705	1,950	3,684	3,639
Provision	(1,856)	546	10,778	2,892
Balance at end of year	$ 48,057	$ 34,374	$ 48,057	$ 34,374	$ 43,163