XML 73 R62.htm IDEA: XBRL DOCUMENT v3.7.0.1
Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Total Fair value $ 1,196,115 $ 1,258,139
Securities Held-to-Maturity, Amortized Cost 322,008 259,833
Securities held-to-maturity, fair value 324,827 256,672
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 260,168  
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value 261,946  
Securities Held-to-Maturity, Amortized Cost 260,168 188,622
Securities held-to-maturity, fair value $ 261,946 184,451
Held to Maturity Securities weighted avg yield 4.49%  
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 75,000  
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value $ 74,900  
Available for Sale Securities Debt Maturities next twelve months Weighted Avg Yield 1.02%  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis $ 195,000  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis $ 193,786  
Available for Sale Securities Debt Maturities two through five Weighted Avg Yield 1.25%  
Securities Available-for-Sale, Total, Amortized cost $ 270,000  
Securities Available-for-Sale, Total Fair value $ 268,686 267,533
Available for Sale Securities Weighted Avg Yield 1.18%  
U.S. Government Sponsored Entities Asset-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Total, Amortized cost $ 923,424  
Securities Available-for-Sale, Total Fair value $ 923,593 987,172
Available for Sale Securities Weighted Avg Yield 2.09%  
Securities Held-to-Maturity, Amortized Cost $ 61,840 71,211
Securities held-to-maturity, fair value $ 62,881 $ 72,221
Held to Maturity Securities weighted avg yield 3.23%