Debt (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Maturity of federal funds purchased from correspondent banks		one business day
Real estate secured loans		$ 1,332,405,000
Current borrowing available		590,981,000
Maximum borrowing capacity		929,518,000
Short term borrowings		196,889,000		$ 125,617,000
Long-term debt outstanding		74,944,000		75,115,000
FHLB prepayment	$ 17,500,000		$ 17,500,000
FHLB prepayment penalties	$ 76,000		$ 139,000
FHLB [Member]
Debt Instrument [Line Items]
Letter of credit outstanding, amount		265,320,000		288,950,000
Paycheck Protection Program Liquidity Facility [Member]
Debt Instrument [Line Items]
Short term borrowings		$ 196,889,000		125,617,000
Short-term borrowings, term		five years
Short-term borrowings, interest Rate		0.35%
Other Correspondent Banks [Member]
Debt Instrument [Line Items]
Outstanding drawings		$ 0		0
Line of credit facility, remaining borrowing capacity		35,000,000
Short term borrowings		0		0
FHLB Short-Term Borrowings [Member]
Debt Instrument [Line Items]
Outstanding drawings		$ 0		$ 0