Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 100,250	$ 90,000	$ 100,800	$ 92,000
Charge-offs	(5,149)	(4,046)	(10,999)	(8,537)
Recoveries	1,693	3,256		5,151
Provision	3,606	4,390	7,515	4,986
Balance, end of period	100,400	93,600	100,400	93,600
ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period			100,152
Charge-offs			(10,999)
Recoveries			3,732
Provision			7,515
Balance, end of period	100,400		100,400
Commercial Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	36,040	28,557		28,941
Charge-offs	(207)	(447)		(1,035)
Recoveries	97	837		930
Provision	1,033	3,411		3,522
Balance, end of period	36,963	32,358	36,963	32,358
Commercial Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period			34,662
Charge-offs			(376)
Recoveries			638
Provision			2,039
Balance, end of period	36,963		36,963
Consumer Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	48,820	43,591		44,253
Charge-offs	(4,837)	(3,509)		(7,100)
Recoveries	1,441	2,117		3,769
Provision	2,459	2,741		4,018
Balance, end of period	47,883	44,940	47,883	44,940
Consumer Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period			50,951
Charge-offs			(10,179)
Recoveries			2,818
Provision			4,293
Balance, end of period	47,883		47,883
Residential [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	15,390	17,852		18,806
Charge-offs	(105)	(90)	(444)	(402)
Recoveries	155	302		452
Provision	114	(1,762)		(2,554)
Balance, end of period	15,554	$ 16,302	15,554	$ 16,302
Residential [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period			14,539
Charge-offs			(444)
Recoveries			276
Provision			1,183
Balance, end of period	$ 15,554		$ 15,554