Debt Securities Held to Maturity - Narrative (Details)	3 Months Ended
Mar. 31, 2023 USD ($) security	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 417,227,000		$ 421,523,000
Fair Value	372,187,000		370,391,000
Proceeds from sale and maturity of held-to-maturity securities	0	$ 0
Fair value of securities sold under agreements to repurchase	$ 346,800,000		$ 228,800,000
Number of positions \| security	114		116
Accrued interest receivable on debt securities held-to-maturity	$ 818,000		$ 1,000,000
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	367,356,000		371,652,000
Fair Value	$ 328,915,000		$ 327,824,000

Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

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