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Debt (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Maturity of federal funds purchased from correspondent banks			one business day
Real estate secured loans	$ 1,168,684,000		$ 1,168,684,000
Current borrowing available	814,982,000		814,982,000
Short term borrowings	203,937,000		203,937,000
Long-term debt outstanding	85,282,000		85,282,000		$ 32,903,000
FHLB prepayment	17,500,000		17,500,000
FHLB prepayment penalties	76,000	$ 0	139,000	$ 0
FHLB [Member]
Debt Instrument [Line Items]
Letter of credit outstanding, amount	212,401,000		212,401,000		169,051,000
Paycheck Protection Program Liquidity Facility [Member]
Debt Instrument [Line Items]
Short term borrowings	$ 203,937,000		$ 203,937,000		0
Short-term borrowings, term			two years
Short-term borrowings, interest Rate	0.35%		0.35%
Other Correspondent Banks [Member]
Debt Instrument [Line Items]
Outstanding drawings			$ 0		0
Line of credit facility, remaining borrowing capacity	$ 35,000,000		35,000,000
Short term borrowings	$ 0		0		0
FHLB Short-Term Borrowings [Member]
Debt Instrument [Line Items]
Outstanding drawings			$ 0		$ 0

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Amount of drawings outstanding on short-term borrowings.

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Federal home loan bank advances penalties.

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Federal home loan bank advances prepayment

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Maturity of Federal funds purchased from correspondent banks.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate.

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