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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 366,256 $ 423,980
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 14,379 6,687
Gross Unrealized Losses 221 828
AFS securities 380,414 429,839
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 141,246 165,005
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,539 4,747
Gross Unrealized Losses 0 0
AFS securities 146,785 169,752
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,200 3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 221 81
AFS securities 2,979 3,119
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 115,224 139,831
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,805 933
Gross Unrealized Losses 0 560
AFS securities 119,029 140,204
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 106,586 115,944
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,035 1,007
Gross Unrealized Losses 0 187
AFS securities $ 111,621 $ 116,764