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Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available for Sale [Abstract] |  |
Amortized Cost | $ 2,427,983 | $ 2,352,013
Gross Unrealized Gains | 31,231 | 34,131
Gross Unrealized (Losses) | (12,831) | (11,577)
Estimated Fair Value | 2,446,383 | 2,374,567
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 1,190,161 | 1,170,685
Gross Unrealized Gains | 14,353 | 15,156
Gross Unrealized (Losses) | (4,297) | (2,995)
Estimated Fair Value | 1,200,217 | 1,182,846
US Treasury Securities [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost |  | 100
Gross Unrealized Gains |  | 0
Gross Unrealized (Losses) |  | 0
Estimated Fair Value |  | 100
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 74,258 | 79,788
Gross Unrealized Gains | 808 | 694
Gross Unrealized (Losses) | (657) | (826)
Estimated Fair Value | 74,409 | 79,656
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 32,748 | 32,725
Gross Unrealized Gains | 261 | 170
Gross Unrealized (Losses) | 0 | (77)
Estimated Fair Value | 33,009 | 32,818
Obligations of States and Political Subdivisions [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 146,711 | 157,001
Gross Unrealized Gains | 4,668 | 5,325
Gross Unrealized (Losses) | (57) | (68)
Estimated Fair Value | 151,322 | 162,258
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 20,349 | 11,897
Gross Unrealized Gains | 508 | 544
Gross Unrealized (Losses) | (206) | (14)
Estimated Fair Value | 20,651 | 12,427
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 181,658 | 199,599
Gross Unrealized Gains | 4,150 | 4,842
Gross Unrealized (Losses) | (157) | 0
Estimated Fair Value | 185,651 | 204,441
Other Residential-Mortgage Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 1,658,085 | 1,655,733
Gross Unrealized Gains | 14,991 | 16,664
Gross Unrealized (Losses) | (10,600) | (10,564)
Estimated Fair Value | 1,662,476 | 1,661,833
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 286,496 | 184,394
Gross Unrealized Gains | 5,056 | 4,968
Gross Unrealized (Losses) | (1,154) | (28)
Estimated Fair Value | 290,398 | 189,334
Asset-Backed Securities and Structured Financial Products [Member] |  |
Securities Available for Sale [Abstract] |  |
Amortized Cost | 27,678 | 30,776
Gross Unrealized Gains | 789 | 924
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | 28,467 | 31,700
US Treasury Securities [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized (Losses) |  | 0
Estimated Fair Value |  | 0
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | 0 | 0
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 101,374 | 100,971
Gross Unrealized Gains | 3,278 | 2,631
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | 104,652 | 103,602
Obligations of States and Political Subdivisions [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 56,978 | 63,505
Gross Unrealized Gains | 2,972 | 3,398
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | 59,950 | 66,903
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 18,265 | 19,115
Gross Unrealized Gains | 335 | 466
Gross Unrealized (Losses) | (82) | (16)
Estimated Fair Value | 18,518 | 19,565
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 10,965 | 11,437
Gross Unrealized Gains | 320 | 471
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | 11,285 | 11,908
Other Residential-Mortgage Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 838,989 | 834,176
Gross Unrealized Gains | 5,496 | 6,440
Gross Unrealized (Losses) | (3,390) | (1,916)
Estimated Fair Value | 841,095 | 838,700
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 163,590 | 141,481
Gross Unrealized Gains | 1,952 | 1,750
Gross Unrealized (Losses) | (825) | (1,063)
Estimated Fair Value | 164,717 | 142,168
Asset-Backed Securities and Structured Financial Products [Member] |  |
Securities Held to Maturity [Abstract] |  |
Amortized Cost | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | $ 0 | $ 0

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