Loans and Allowance for Credit Losses - Detail activity in the allowance for credit losses by portfolio segment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	$ 74,965	$ 109,579	$ 73,658
Loans charged-off	2,995	14,439	20,259
Recoveries of loans previously charged-off	2,371	1,100	162
Net loans charged-off	(624)	(13,339)	(20,097)
Provision for credit losses	(103)	21,275	(45,404)
Ending balance	74,444	74,965	109,579
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	10,614
Ending balance			0
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	14,475	26,569	18,832
Loans charged-off	1,561	8,788	12,082
Recoveries of loans previously charged-off	713	486	130
Net loans charged-off	(848)	(8,302)	(11,952)
Provision for credit losses	(2,028)	3,792	(18,797)
Ending balance	15,655	14,475	26,569
Commercial \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	892
Ending balance			0
Income producing - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	38,287	55,385	29,265
Loans charged-off	1,355	0	4,300
Recoveries of loans previously charged-off	25	0	0
Net loans charged-off	(1,330)	0	(4,300)
Provision for credit losses	1,269	17,098	(19,190)
Ending balance	35,688	38,287	55,385
Income producing - commercial real estate \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	11,230
Ending balance			0
Owner occupied - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	12,146	14,000	5,838
Loans charged-off	0	5,444	20
Recoveries of loans previously charged-off	0	97	0
Net loans charged-off	0	(5,347)	(20)
Provision for credit losses	(556)	(3,493)	(3,508)
Ending balance	12,702	12,146	14,000
Owner occupied - commercial real estate \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	4,674
Ending balance			0
Real estate mortgage - residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	449	1,020	1,557
Loans charged-off	0	0	815
Recoveries of loans previously charged-off	0	0	0
Net loans charged-off	0	0	(815)
Provision for credit losses	(520)	571	(579)
Ending balance	969	449	1,020
Real estate mortgage - residential \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	(301)
Ending balance			0
Construction - commercial and residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	9,099	11,529	17,485
Loans charged-off	0	206	2,947
Recoveries of loans previously charged-off	1,627	499	4
Net loans charged-off	1,627	293	(2,943)
Provision for credit losses	1,925	2,723	(3,130)
Ending balance	8,801	9,099	11,529
Construction - commercial and residential \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	(6,143)
Ending balance			0
Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	474	1,039	656
Loans charged-off	0	0	92
Recoveries of loans previously charged-off	0	0	0
Net loans charged-off	0	0	(92)
Provision for credit losses	(81)	565	(230)
Ending balance	555	474	1,039
Home equity \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		0	245
Ending balance			0
Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,	35	37	25
Loans charged-off	79	1	3
Recoveries of loans previously charged-off	6	18	28
Net loans charged-off	(73)	17	25
Provision for credit losses	(112)	19	30
Ending balance	$ 74	35	37
Other Consumer \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at January 1,		$ 0	17
Ending balance			$ 0

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, 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 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 expense related to estimated loss from loan and lease transactions.

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