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Allowance for Credit Losses and Credit Quality of Loans, Changes in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			$ 72,965	$ 72,505
Charge-offs				(32,540)
Recoveries				7,588
Provision	[1]	$ (8,257)	51,134	25,412
Balance, end of period				72,965
Commercial Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			34,525	32,759
Charge-offs				(3,151)
Recoveries				534
Provision		(18,086)	27,005	4,383
Balance, end of period				34,525
Consumer Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			35,647	37,178
Charge-offs				(28,398)
Recoveries				6,913
Provision		12,368	19,078	19,954
Balance, end of period				35,647
Residential Real Estate [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			2,793	2,568
Charge-offs				(991)
Recoveries				141
Provision		$ (2,539)	$ 5,051	1,075
Balance, end of period				$ 2,793
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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Amount of credit loss expense (reversal of expense) for financing receivable.

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