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Securities - Cost basis, unrealized gains and losses, and fair value of securities available for sale (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Investment securities available for sale:    
Amortized Cost $ 2,303,716 $ 2,294,491
Gross Unrealized Gains 38,660 14,581
Gross Unrealized Losses 6,865 17,561
Available-for-Sale, Fair Value 2,335,511 2,291,511
U.S. Treasuries    
Investment securities available for sale:    
Amortized Cost 140,537 169,034
Gross Unrealized Gains 5,021 156
Gross Unrealized Losses 484
Available-for-Sale, Fair Value 145,558 168,706
U.S. Government agencies    
Investment securities available for sale:    
Amortized Cost 38,659 112,394
Gross Unrealized Gains 726 385
Gross Unrealized Losses 439
Available-for-Sale, Fair Value 39,385 112,340
State and political subdivisions    
Investment securities available for sale:    
Amortized Cost 68,962 56,265
Gross Unrealized Gains 2,145 461
Gross Unrealized Losses 458
Available-for-Sale, Fair Value 71,107 56,268
Mortgage-backed securities    
Investment securities available for sale:    
Amortized Cost [1] 1,218,928 1,108,206
Gross Unrealized Gains [1] 24,653 12,077
Gross Unrealized Losses [1] 1,560 7,165
Available-for-Sale, Fair Value [1] 1,242,021 1,113,118
Corporate bonds    
Investment securities available for sale:    
Amortized Cost 307,653 308,102
Gross Unrealized Gains 4,631 933
Gross Unrealized Losses 1,161 3,009
Available-for-Sale, Fair Value 311,123 306,026
Asset-backed securities    
Investment securities available for sale:    
Amortized Cost 527,852 538,679
Gross Unrealized Gains 1,484 569
Gross Unrealized Losses 4,144 6,006
Available-for-Sale, Fair Value 525,192 533,242
Other    
Investment securities available for sale:    
Amortized Cost 1,125 1,811
Gross Unrealized Gains
Gross Unrealized Losses
Available-for-Sale, Fair Value $ 1,125 $ 1,811
[1] All are residential type mortgage-backed securities or U.S. government agency commercial mortgage backed securities.