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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 47,505	$ 52,082	$ 51,669	$ 39,892
Charge-offs	(210)	(175)	(543)	(1,748)
Recoveries	141	187	1,538	538
(Credit) provision for credit loss expense	(1,177)	199	(6,405)	16,145
Ending balance	46,259	52,293	46,259	52,293
Allowance for credit losses for off-balance	2,200		2,200		$ 1,900
Provision off-balance sheet, loss expense (reversal)	(55)	(417)	(272)	1,300
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,113	11,113	9,239	10,541
Charge-offs	(157)	0	(274)	(1)
Recoveries	16	89	116	125
(Credit) provision for credit loss expense	(774)	(3,918)	(2,883)	(1,373)
Ending balance	6,198	7,284	6,198	7,284
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	29,201	24,286	30,546	21,608
Charge-offs	0	0	0	(1,305)
Recoveries	2	9	1,040	40
(Credit) provision for credit loss expense	(119)	4,264	(2,502)	14,133
Ending balance	29,084	28,559	29,084	28,559
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,534	15,012	10,257	6,381
Charge-offs	0	(30)	(51)	(33)
Recoveries	65	16	229	178
(Credit) provision for credit loss expense	(184)	(65)	(1,020)	3,948
Ending balance	9,415	14,933	9,415	14,933
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,590	1,596	1,562	1,362
Charge-offs	(53)	(145)	(218)	(409)
Recoveries	58	73	153	195
(Credit) provision for credit loss expense	(99)	(75)	(1)	(549)
Ending balance	1,496	1,449	1,496	1,449
Finance Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	67	75	65	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
(Credit) provision for credit loss expense	(1)	(7)	1	(14)
Ending balance	$ 66	$ 68	66	68
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			$ 2,500	(2,534)
Cumulative Effect, Period of Adoption, Adjustment \| Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				(2,008)
Cumulative Effect, Period of Adoption, Adjustment \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				(5,917)
Cumulative Effect, Period of Adoption, Adjustment \| Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				4,459
Cumulative Effect, Period of Adoption, Adjustment \| Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				850
Cumulative Effect, Period of Adoption, Adjustment \| Finance Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 82

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

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

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-Publisher FASB
-Name Accounting Standards Codification
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