Repurchase Agreements and Other Borrowings - Additional Information (Details) - USD ($)		12 Months Ended
	Oct. 06, 2020	Dec. 31, 2022	Dec. 31, 2021	May 01, 2018	Sep. 08, 2016	Apr. 26, 2006
Repurchase Agreements And Other Borrowings [Line Items]
Federal Home Loan Bank Advances		$ 464,700,000
Repurchase agreements with customers		221,414,000	$ 146,268,000
Securities sold under agreements to repurchase increase (decrease)		$ 75,100,000
Securities sold under agreements to repurchase weighted average rate		2.30%
Debt issuance costs		$ 1,400,000
Debt issuance discount		1,200,000
Subordinated debt, net		94,553,000	94,400,000
Junior subordinated debentures, net		19,364,000	19,195,000
Junior Subordinated Debentures
Repurchase Agreements And Other Borrowings [Line Items]
Junior subordinated debentures, net		$ 19,364,000
3.95% Subordinated Notes due 2030
Repurchase Agreements And Other Borrowings [Line Items]
Aggregate principal amount	$ 96,000,000.0
Fixed-to-Floating Rate	3.95%
Maturity date	Oct. 15, 2030
Basis points	3.83%
Redemption description		The Company may, beginning with the interest payment date of October 15, 2025, and on any interest payment date thereafter, redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to but excluding the date of redemption. The Company may also redeem the Notes at any time, including prior to October 15, 2025, at the Company’s option, in whole but not in part, if: (i) a change or prospective change in law occurs that could prevent the Company from deducting interest payable on the Notes for U.S. federal income tax purposes; (ii) a subsequent event occurs that could preclude the Notes from being recognized as Tier 2 capital for regulatory capital purposes; or (iii) the Company is required to register as an investment company under the Investment Company Act of 1940, as amended; in each case, at a redemption price equal to 100% of the principal amount of the Notes plus any accrued and unpaid interest to but excluding the redemption date.
3.95% Subordinated Notes due 2030 | SOFR
Repurchase Agreements And Other Borrowings [Line Items]
Description floating rate basis		three-month Term SOFR
FMIS Trust II
Repurchase Agreements And Other Borrowings [Line Items]
Trust preferred securities issued						$ 10,000,000
Investment in statutory trust						$ 310,000
Junior subordinated debentures, net			$ 10,310,000
FMIS Trust II | Junior Subordinated Debentures
Repurchase Agreements And Other Borrowings [Line Items]
Fixed-to-Floating Rate		6.37%	1.80%
Debt instrument, interest rate terms		bore interest at a fixed rate of 6.98% paid quarterly until June 15, 2011 and then converted to floating rate (LIBOR plus 160 basis points) after June 15, 2011
CLS Trust I
Repurchase Agreements And Other Borrowings [Line Items]
Trust preferred securities issued					$ 4,000,000
Investment in statutory trust					$ 124,000
CLS Trust I | Junior Subordinated Debentures
Repurchase Agreements And Other Borrowings [Line Items]
Fixed-to-Floating Rate		6.47%	2.05%
Debt instrument, interest rate terms		bear interest at three-month LIBOR plus 185 basis points
FBTCST I
Repurchase Agreements And Other Borrowings [Line Items]
Trust preferred securities issued				$ 6,000,000
Investment in statutory trust				$ 186,000
FBTCST I | Junior Subordinated Debentures
Repurchase Agreements And Other Borrowings [Line Items]
Fixed-to-Floating Rate		6.62%	1.90%
Debt instrument, interest rate terms		bear interest at three-month LIBOR plus 170 basis points
Revolving Credit Facility
Repurchase Agreements And Other Borrowings [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15,000,000
Line of credit facility, interest rate spread		2.25%