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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
State and Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 214,497 $ 247,509
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (7,125) (15,676)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 214,497 247,509
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (7,125) (15,676)
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,020 11,922
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (9) (110)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 32,148 34,629
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,417) (4,475)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 36,168 46,551
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (2,426) (4,585)
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 144,523 166,905
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,057) (3,899)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 231,936 258,237
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (6,682) (8,279)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 376,459 425,142
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (9,739) (12,178)
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 896,206 1,112,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10,974) (16,900)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 896,206 1,112,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (10,974) (16,900)
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 68,546 24,563
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (335) (537)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 68,546 24,563
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (335) (537)
Auction Rate Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 97,923 97,256
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (9,487) (9,959)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 97,923 97,256
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (9,487) (9,959)
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,327,792 1,563,846
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (21,500) (37,122)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 362,007 390,122
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (18,586) (22,713)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,689,799 1,953,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (40,086) $ (59,835)