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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	$ 7,805,284		$ 7,725,702
ACL	(91,639)	$ (91,727)	(91,608)	$ (88,757)	$ (88,213)	$ (87,887)
Portfolio loans, net	7,713,645		7,634,094
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	5,793,426		5,766,496
ACL	(63,237)		(68,616)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,899,718		1,974,154
ACL	(24,510)	(24,276)	(23,860)	(23,359)	(24,173)	(23,855)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	3,361,308		3,261,873
ACL	(33,656)	(34,421)	(38,299)	(37,182)	(37,339)	(38,249)
Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	532,400		530,469
ACL	(5,071)	(5,159)	(6,457)	(5,669)	(5,705)	(5,102)
Total retail loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	2,011,858		1,959,206
ACL	(28,402)		(22,992)
Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,703,057		1,657,082
ACL	(24,675)	(24,255)	(18,193)	(17,984)	(17,555)	(17,589)
Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	308,801		302,124
ACL	$ (3,727)	$ (3,616)	$ (4,799)	$ (4,563)	$ (3,441)	$ (3,092)

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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