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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		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			$ 72,165	$ 72,965	[1]	$ 72,505
Charge-offs			(8,015)			(24,901)
Recoveries			1,891			5,353
Provision	[1]	$ 3,261	6,324	51,741		19,408
Balance, end of period			72,365			72,365
Commercial Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			33,152	34,525		32,759
Charge-offs			(865)			(2,783)
Recoveries			132			344
Provision			1,021			3,120
Balance, end of period			33,440			33,440
Consumer Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			36,534	35,647		37,178
Charge-offs			(6,976)			(21,336)
Recoveries			1,746			4,887
Provision			5,031			15,606
Balance, end of period			36,335			36,335
Residential Real Estate [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period			2,479	$ 2,793		2,568
Charge-offs			(174)			(782)
Recoveries			13			122
Provision			272			682
Balance, end of period			$ 2,590			$ 2,590
[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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

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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-Topic 310
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of credit loss expense (reversal of expense) for financing receivable.

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