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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 $ 1,178
Fair Value, Less Than Twelve Months 132 80,103
Gross Unrealized Losses, Twelve Months or More 4,520 7,505
Fair Value, Twelve Months or More 271,222 229,996
Total Unrealized Losses $ 4,520 $ 8,683
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 1 66
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 100 102
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 101 168
Government sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 $ 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 1 2
Fair Value, Twelve Months or More 165 170
Total Unrealized Losses 1 2
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 83
Fair Value, Less Than Twelve Months 0 14,732
Gross Unrealized Losses, Twelve Months or More 16 168
Fair Value, Twelve Months or More 6,838 15,090
Total Unrealized Losses 16 251
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 381 646
Fair Value, Twelve Months or More 2,819 2,554
Total Unrealized Losses 381 646
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 896
Fair Value, Less Than Twelve Months 0 43,485
Gross Unrealized Losses, Twelve Months or More 2,843 4,384
Fair Value, Twelve Months or More 163,726 124,253
Total Unrealized Losses 2,843 5,280
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 199
Fair Value, Less Than Twelve Months 132 21,886
Gross Unrealized Losses, Twelve Months or More 1,279 2,305
Fair Value, Twelve Months or More 97,674 87,929
Total Unrealized Losses $ 1,279 $ 2,504