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AFS Securities (Amortized cost and fair value of AFS securities by contractual maturity) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less $ 24,933
Maturing, After One Year But Within Five Years 79,557
Maturing, After Five Years But Within Ten Years 71,772
Maturing, After Ten Years 33,731
Securities With Variable Monthly Payments or Noncontractual Maturities 345,008
Amortized Cost 555,001
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less, Fair value 24,968
Maturing, After One Year But Within Five Years, Fair value 80,351
Maturing, After Five Years But Within Ten Years, Fair value 72,692
Maturing, After Ten Years, Fair value 33,824
Securities With Variable Monthly Payments or Noncontractual Maturities, Fair value 335,927
Total, Fair value 547,762
Government sponsored enterprises [Member]  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less 0
Maturing, After One Year But Within Five Years 205
Maturing, After Five Years But Within Ten Years 0
Maturing, After Ten Years 0
Securities With Variable Monthly Payments or Noncontractual Maturities 0
Amortized Cost 205
States and political subdivisions [Member]  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less 24,933
Maturing, After One Year But Within Five Years 79,352
Maturing, After Five Years But Within Ten Years 71,772
Maturing, After Ten Years 33,731
Securities With Variable Monthly Payments or Noncontractual Maturities 0
Amortized Cost 209,788
Auction rate money market preferred [Member]  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less 0
Maturing, After One Year But Within Five Years 0
Maturing, After Five Years But Within Ten Years 0
Maturing, After Ten Years 0
Securities With Variable Monthly Payments or Noncontractual Maturities 3,200
Amortized Cost 3,200
Mortgage-backed securities [Member]  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less 0
Maturing, After One Year But Within Five Years 0
Maturing, After Five Years But Within Ten Years 0
Maturing, After Ten Years 0
Securities With Variable Monthly Payments or Noncontractual Maturities 212,713
Amortized Cost 212,713
Collateralized mortgage obligations [Member]  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]  
Maturing, Due in One Year or Less 0
Maturing, After One Year But Within Five Years 0
Maturing, After Five Years But Within Ten Years 0
Maturing, After Ten Years 0
Securities With Variable Monthly Payments or Noncontractual Maturities 129,095
Amortized Cost $ 129,095