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Investment Securities Investment Securities, Part III (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 83,588  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 128,818  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 93,754  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 3,906  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis 310,066  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]    
Available-for-sale Debt Securities, Amortized Cost Basis 628,895  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 318,829  
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]    
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value 81,998  
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value 128,318  
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value 91,958  
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value 2,583  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 304,857  
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 314,991  
Fair Value 619,848 $ 518,848
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount 44,992  
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 29,239  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 0  
Held-to-maturity, at amortized cost (estimated fair value of $73,096 at December 31, 2016 and $85,737 at December 31, 2015) 74,231 85,208
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]    
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value 43,798  
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value 29,298  
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value 0  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 0  
Held-to-maturity Securities, Fair Value $ 73,096 $ 85,737