Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Debt securities, available-for-sale, amortized cost	$ 664,882,000	$ 565,493,000
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	60,375	60,375
Preferred stock, shares issued (in shares)	60,375	60,375
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	16,978,057	16,978,057
Treasury stock, shares (in shares)	93,538	145,049