Other Borrowings and Notes Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Feb. 23, 2016
Debt Instrument [Line Items]
Loans Payable	$ 22,857,000	$ 30,000,000
Line of Credit, Current			$ 25,000,000
Securities sold under agreement to repurchase	331,006,000	271,081,000
Total	353,863,000	301,081,000
Unsecured term loan, face amount	40,000,000
paycheck protection program liquidity facility funds	86,100,000
Other Borrowings
Debt Instrument [Line Items]
Maximum balance outstanding at any month-end	331,006,000	271,081,000
Average balance during the year	$ 225,895,000	$ 206,338,000
Average interest rate during the year	0.10%	0.23%
Average interest rate at December 31	0.06%	0.07%
Line of Credit
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 1,100,000,000
Aggregate of pledge secured by certain eligible loans	1,300,000,000
Amount withdrawn	0
Unsecured Term Loan
Debt Instrument [Line Items]
Maximum balance outstanding at any month-end	28,571,000	$ 34,286,000
Average balance during the year	$ 26,427,000	$ 32,123,000
Average interest rate during the year	1.40%	1.96%
Average interest rate at December 31	1.38%	1.44%