Loans and Allowance for Credit Losses - Detail activity in the allowance for credit losses by portfolio segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 74,965	$ 109,579
Loans charged-off	(514)	(5,357)
Recoveries of loans previously charged-off	55	109
Net loans charged-off	(459)	(5,248)
Provision for (reversal of) credit losses	(3,001)	(2,261)
Ending Balance	71,505	102,070
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,475	26,569
Loans charged-off	(514)	(4,150)
Recoveries of loans previously charged-off	54	96
Net loans charged-off	(460)	(4,054)
Provision for (reversal of) credit losses	(1,069)	1,186
Ending Balance	12,946	23,701
Income-producing - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	38,287	55,385
Loans charged-off	0	(1,000)
Recoveries of loans previously charged-off	0	0
Net loans charged-off	0	(1,000)
Provision for (reversal of) credit losses	906	(2,875)
Ending Balance	39,193	51,510
Owner-occupied - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,146	14,000
Loans charged-off	0	0
Recoveries of loans previously charged-off	0	0
Net loans charged-off	0	0
Provision for (reversal of) credit losses	(1,631)	315
Ending Balance	10,515	14,315
Real estate mortgage - residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	449	1,020
Loans charged-off	0	0
Recoveries of loans previously charged-off	0	0
Net loans charged-off	0	0
Provision for (reversal of) credit losses	(68)	(101)
Ending Balance	381	919
Construction - commercial and residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,099	11,529
Loans charged-off	0	(206)
Recoveries of loans previously charged-off	0	0
Net loans charged-off	0	(206)
Provision for (reversal of) credit losses	(1,126)	(640)
Ending Balance	7,973	10,683
Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	474	1,039
Loans charged-off	0	0
Recoveries of loans previously charged-off	0	0
Net loans charged-off	0	0
Provision for (reversal of) credit losses	(7)	(132)
Ending Balance	467	907
Other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	35	37
Loans charged-off	0	(1)
Recoveries of loans previously charged-off	1	13
Net loans charged-off	1	12
Provision for (reversal of) credit losses	(6)	(14)
Ending Balance	$ 30	$ 35

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

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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.

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- Definition

Amount, after recoveries, of loans and leases that have been written-off.

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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 expense related to estimated loss from loan and lease transactions.

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