Borrowings - Notes payable (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Notes payable	$ 1,004,649	$ 886,710
Advances with FHLB with maturities ranging from 2023 Through 2029
Debt Instrument [Line Items]
FHLB advances	412,632	389,282
Unsecured senior debt \| Fixed Rate maturing on 2028 paying interest semiannually
Debt Instrument [Line Items]
Long Term Debt	393,678	299,109
Junior subordinated debt \| Fixed Rate maturing on 2034
Debt Instrument [Line Items]
Long Term Debt	$ 198,339	$ 198,319

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant