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Investment Securities (Marketable Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis $ 1,731,292 $ 1,807,913
Available-for-sale securities, Gross unrealized gains (14,766) (22,145)
Available-for-sale securities, Gross unrealized losses (29,670) (37,980)
Available-for-sale Securities 1,716,388 1,792,078
Held-to-maturity securities 884,826 0
Held-to-maturity securities, Gross unrealized gains (871) 0
Held-to-maturity securities, Gross unrealized losses (7,586) 0
Held-to-maturity securities, fair value 878,111 0
U.S. Treasury    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis 312,282 388,713
Available-for-sale securities, Gross unrealized gains 0 (84)
Available-for-sale securities, Gross unrealized losses (5,553) (6,992)
Available-for-sale Securities 306,729 381,805
US Government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis 70,313 686,106
Available-for-sale securities, Gross unrealized gains (198) (4,113)
Available-for-sale securities, Gross unrealized losses (275) (21,903)
Available-for-sale Securities 70,236 668,316
Held-to-maturity securities 687,302  
Held-to-maturity securities, Gross unrealized gains (4)  
Held-to-maturity securities, Gross unrealized losses (7,144)  
Held-to-maturity securities, fair value 680,162  
Municipal    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis 105,702 234,951
Available-for-sale securities, Gross unrealized gains (3,249) (5,318)
Available-for-sale securities, Gross unrealized losses (356) (1,740)
Available-for-sale Securities 108,595 238,529
Held-to-maturity securities 197,524  
Held-to-maturity securities, Gross unrealized gains (867)  
Held-to-maturity securities, Gross unrealized losses (442)  
Held-to-maturity securities, fair value 197,949  
Corporate notes, financial issuers    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis 80,014 129,309
Available-for-sale securities, Gross unrealized gains (1,510) (2,006)
Available-for-sale securities, Gross unrealized losses (1,481) (1,557)
Available-for-sale Securities 80,043 129,758
Corporate notes, other    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis 1,500 3,766
Available-for-sale securities, Gross unrealized gains (4) (55)
Available-for-sale securities, Gross unrealized losses (2) 0
Available-for-sale Securities 1,502 3,821
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis [1] 1,069,680 271,129
Available-for-sale securities, Gross unrealized gains [1] (3,834) (5,448)
Available-for-sale securities, Gross unrealized losses [1] (21,004) (4,928)
Available-for-sale Securities [1] 1,052,510 271,649
Mortgage-backed, collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis [1] 40,421 47,347
Available-for-sale securities, Gross unrealized gains [1] (172) (249)
Available-for-sale securities, Gross unrealized losses [1] (506) (535)
Available-for-sale Securities [1] 40,087 47,061
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost Basis 51,380 46,592
Available-for-sale securities, Gross unrealized gains (5,799) (4,872)
Available-for-sale securities, Gross unrealized losses (493) (325)
Available-for-sale Securities $ 56,686 $ 51,139
[1] (1)Consisting entirely of residential mortgage-backed securities, none of which are subprime.