Borrowings - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 21, 2021
Debt Instrument [Line Items]
Balance	$ 377,309,000	$ 799,364,000
Unused line of credit	250,000,000	250,000,000
Advances from federal home loan banks	$ 1,900,000,000	$ 2,100,000,000
Weighted Average Interest Rate	1.38%	1.20%
Subsidiaries
Debt Instrument [Line Items]
Unused line of credit	$ 15,000,000	$ 15,000,000
Advances from federal home loan banks	25,100,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	30,000,000
Line of Credit
Debt Instrument [Line Items]
Balance	0
Interest expense, debt	7,000	425,000	$ 1,800,000
Securities sold under agreements to repurchase
Debt Instrument [Line Items]
Advances from federal home loan banks	148,100,000	222,400,000
Securities sold under agreements to repurchase | Subsidiaries
Debt Instrument [Line Items]
Advances from federal home loan banks	44,100,000
FHLB advances
Debt Instrument [Line Items]
Balance	340,495,000	792,412,000
Interest expense, debt	$ 7,600,000	$ 17,700,000	25,200,000
Weighted Average Interest Rate	1.17%	1.18%
Notes payable
Debt Instrument [Line Items]
Balance	$ 29,841,000	$ 0		$ 30,000,000
Interest expense, debt	$ 25,000
Weighted Average Interest Rate	3.35%	0.00%
Junior subordinated debt
Debt Instrument [Line Items]
Balance	$ 6,973,000	$ 6,952,000
Interest expense, debt	$ 245,000	$ 295,000	$ 65,000
Weighted Average Interest Rate	3.07%	3.20%
Interest rate, effective percentage	3.07%	3.20%
Subordinated notes
Debt Instrument [Line Items]
Interest expense, debt	$ 0	$ 448,000
Interest rate swaps | FHLB advances
Debt Instrument [Line Items]
Notional amount of derivative	$ 190,000,000	$ 430,000,000
London Interbank Offered Rate (LIBOR) | Junior subordinated debt
Debt Instrument [Line Items]
Basis spread on variable rate	2.95%