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Allowance for Credit Losses - Schedule of Detail in Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 52,082	$ 40,790	$ 39,892	$ 43,410
Charge-offs	(175)	(834)	(1,748)	(5,140)
Recoveries	187	95	538	735
Provision for credit loss expense	199	1,320	16,145	2,366
Ending balance	52,293	41,371	52,293	41,371
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,113	11,543	10,541	11,272
Charge-offs	0	(6)	(1)	(489)
Recoveries	89	10	125	92
Provision for credit loss expense	(3,918)	(256)	(1,373)	416
Ending balance	7,284	11,291	7,284	11,291
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	24,286	21,005	21,608	23,483
Charge-offs	0	(551)	(1,305)	(3,949)
Recoveries	9	2	40	107
Provision for credit loss expense	4,264	2,143	14,133	2,958
Ending balance	28,559	22,599	28,559	22,599
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,012	6,897	6,381	7,345
Charge-offs	(30)	(87)	(33)	(131)
Recoveries	16	15	178	319
Provision for credit loss expense	(65)	(733)	3,948	(1,441)
Ending balance	14,933	6,092	14,933	6,092
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,596	1,345	1,362	1,310
Charge-offs	(145)	(190)	(409)	(571)
Recoveries	73	68	195	217
Provision for credit loss expense	(75)	166	(549)	433
Ending balance	1,449	1,389	1,449	1,389
Finance Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	75	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for credit loss expense	(7)	0	(14)	0
Ending balance	$ 68	$ 0	68	$ 0
Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(2,534)
Impact of adopting ASC 326 | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(2,008)
Impact of adopting ASC 326 | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(5,917)
Impact of adopting ASC 326 | Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			4,459
Impact of adopting ASC 326 | Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			850
Impact of adopting ASC 326 | Finance Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			$ 82

X

- Definition

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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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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

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