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Allowance for Loan and Lease Losses - Schedule of Detail in Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 39,892	$ 43,410
Charge-offs	(1,430)	(3,921)
Recoveries	182	394
Provision for credit loss expense	16,294	445
Ending balance	52,404	40,328
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,541	11,272
Charge-offs	(1)	(380)
Recoveries	16	59
Provision for credit loss expense	3,117	572
Ending balance	11,665	11,523
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	21,608	23,483
Charge-offs	(1,290)	(3,343)
Recoveries	18	7
Provision for credit loss expense	8,027	923
Ending balance	22,446	21,070
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,381	7,345
Charge-offs	(2)	(18)
Recoveries	79	233
Provision for credit loss expense	5,413	(1,098)
Ending balance	16,330	6,462
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,362	1,310
Charge-offs	(137)	(180)
Recoveries	69	95
Provision for credit loss expense	(261)	48
Ending balance	1,883	1,273
Finance Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0
Charge-offs	0	0
Recoveries	0	0
Provision for credit loss expense	(2)	0
Ending balance	80	$ 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.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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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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