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Borrowings and Related Interest (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2003
Debt Instrument [Line Items]
Investment Sold to Extinguish Debt	$ 191,200
Subordinated Debt	36,083	$ 36,083
Trust redeemable preferred securities issued				$ 35,000
Gains Losses On Extinguishment Of Debt	(7)	0	$ (80)
Securities sold under agreements to repurchase	190,274	455,508
Investment securities available-for-sale	680,466	17,837	$ 256,996
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Loans pledged as collateral to secure FHLB advances	1,060,000	847,300
Additional Borrowing Capacity	$ 983,000	$ 762,000
Weighted average period remaining maturity of FHLB advances	22 months 21 days	26 months 18 days
Interest payable	$ 160	$ 176
Minimum amount of qualifying collateral	110.00%
Minimum [Member] | Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Debt instrument term	1 day
Maximum [Member] | Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Debt instrument term	7 years
Repurchase agreement
Debt Instrument [Line Items]
Interest payable	$ 274	$ 785
Extinguished and Matured Debt	$ 73,700
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Effective interest rate	4.85%	5.74%
Face amount	$ 36,100
Debt Instrument Interest Rate Terms	3-month LIBOR plus 295 basis points
Debt Instrument Basis Spread On Variable Rate	2.95%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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