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Amortized Cost and Fair Value of AFS Investment Securities (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Total Investment Securities, Weighted Yield | 3.10% | 2.71%
Total Investment Securities, Amortized Cost | $ 3,208,941,000 | $ 3,587,677,000
Total Investment Securities, Gross Unrealized Gains | 49,801,000 | 101,778,000
Total Investment Securities, Gross Unrealized Losses | (35,913,000) | (6,450,000)
Total Investment Securities, Fair Value | 3,222,829,000 | 3,683,005,000
U.S. government and federal agency |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing within One Year, Weighted Yield |  | 1.62%
Maturing within One Year, Amortized Cost |  | 201,000
Maturing within One Year, Gross Unrealized Gains |  | 1,000
Maturing within One Year, Gross Unrealized Losses |  | 0
Maturing within One Year, Fair Value |  | 202,000
U.S. government sponsored enterprises |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing after One Through Five Year, Weighted Yield | 2.32% | 2.30%
Maturing after Five Through Ten Years, Weighted Yield | 2.00% | 2.03%
Total Investment Securities, Weighted Yield | 2.32% | 2.29%
Maturing after One Through Five Years, Amortized Cost | 10,405,000 | 17,064,000
Maturing after Five Through Ten Years, Amortized Cost | 36,000 | 44,000
Total Investment Securities, Amortized Cost | 10,441,000 | 17,108,000
Maturing after One Through Five Years Gross Unrealized Gains | 187,000 | 371,000
Maturing after Five Through Ten Years Gross Unrealized Gains | 0 | 1,000
Total Investment Securities, Gross Unrealized Gains | 187,000 | 372,000
Maturing after One Through Five Years, Gross Unrealized Losses | 0 | 0
Maturing after Five Through Ten Years, Gross Unrealized Losses | 0 | 0
Total Investment Securities, Gross Unrealized Losses | 0 | 0
Maturing after One Through Five Years, Fair Value | 10,592,000 | 17,435,000
Maturing after Five Through Ten Years, Fair Value | 36,000 | 45,000
Total Investment Securities, Fair Value | 10,628,000 | 17,480,000
State and local governments |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing within One Year, Weighted Yield | 2.22% | 2.01%
Maturing after One Through Five Year, Weighted Yield | 2.06% | 2.11%
Maturing after Five Through Ten Years, Weighted Yield | 3.21% | 2.95%
Maturing after Ten Years, Weighted Yield | 4.41% | 4.70%
Total Investment Securities, Weighted Yield | 4.06% | 4.29%
Maturing within One Year, Amortized Cost | 5,964,000 | 4,288,000
Maturing after One Through Five Years, Amortized Cost | 174,826,000 | 149,497,000
Maturing after Five Through Ten Years, Amortized Cost | 58,835,000 | 38,346,000
Maturing after Ten Years, Amortized Cost | 1,137,722,000 | 935,897,000
Total Investment Securities, Amortized Cost | 1,377,347,000 | 1,128,028,000
Maturing within One Year, Gross Unrealized Gains | 57,000 | 28,000
Maturing after One Through Five Years Gross Unrealized Gains | 3,486,000 | 4,142,000
Maturing after Five Through Ten Years Gross Unrealized Gains | 831,000 | 1,102,000
Maturing after Ten Years, Gross Unrealized Gains | 27,247,000 | 82,823,000
Total Investment Securities, Gross Unrealized Gains | 31,621,000 | 88,095,000
Maturing within One Year, Gross Unrealized Losses | 0 | (2,000)
Maturing after One Through Five Years, Gross Unrealized Losses | (448,000) | (142,000)
Maturing after Five Through Ten Years, Gross Unrealized Losses | (1,040,000) | (99,000)
Maturing after Ten Years, Gross Unrealized Losses | (22,402,000) | (1,362,000)
Total Investment Securities, Gross Unrealized Losses | (23,890,000) | (1,605,000)
Maturing within One Year, Fair Value | 6,021,000 | 4,314,000
Maturing after One Through Five Years, Fair Value | 177,864,000 | 153,497,000
Maturing after Five Through Ten Years, Fair Value | 58,626,000 | 39,349,000
Maturing after Ten Years, Fair Value | 1,142,567,000 | 1,017,358,000
Total Investment Securities, Fair Value | 1,385,078,000 | 1,214,518,000
Corporate bonds |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing within One Year, Weighted Yield | 2.17% | 1.73%
Maturing after One Through Five Year, Weighted Yield | 2.09% | 2.22%
Maturing after Five Through Ten Years, Weighted Yield | 2.23% | 2.23%
Total Investment Securities, Weighted Yield | 2.11% | 2.19%
Maturing within One Year, Amortized Cost | 91,687,000 | 18,412,000
Maturing after One Through Five Years, Amortized Cost | 341,799,000 | 250,027,000
Maturing after Five Through Ten Years, Amortized Cost | 6,851,000 | 16,144,000
Total Investment Securities, Amortized Cost | 440,337,000 | 284,583,000
Maturing within One Year, Gross Unrealized Gains | 719,000 | 51,000
Maturing after One Through Five Years Gross Unrealized Gains | 3,203,000 | 4,018,000
Maturing after Five Through Ten Years Gross Unrealized Gains | 0 | 381,000
Total Investment Securities, Gross Unrealized Gains | 3,922,000 | 4,450,000
Maturing within One Year, Gross Unrealized Losses | 0 | 0
Maturing after One Through Five Years, Gross Unrealized Losses | (1,676,000) | (238,000)
Maturing after Five Through Ten Years, Gross Unrealized Losses | (82,000) | 0
Total Investment Securities, Gross Unrealized Losses | (1,758,000) | (238,000)
Maturing within One Year, Fair Value | 92,406,000 | 18,463,000
Maturing after One Through Five Years, Fair Value | 343,326,000 | 253,807,000
Maturing after Five Through Ten Years, Fair Value | 6,769,000 | 16,525,000
Total Investment Securities, Fair Value | 442,501,000 | 288,795,000
Collateralized debt obligations |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing after Ten Years, Weighted Yield |  | 8.03%
Maturing after Ten Years, Amortized Cost |  | 1,708,000
Maturing after Ten Years, Gross Unrealized Gains |  | 0
Maturing after Ten Years, Gross Unrealized Losses |  | 0
Maturing after Ten Years, Fair Value |  | 1,708,000
Residential mortgage-backed securities |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Total Investment Securities, Weighted Yield | 2.48% | 1.95%
Total Investment Securities, Amortized Cost | 1,380,816,000 | 2,156,049,000
Total Investment Securities, Gross Unrealized Gains | 14,071,000 | 8,860,000
Total Investment Securities, Gross Unrealized Losses | (10,265,000) | (4,607,000)
Total Investment Securities, Fair Value | $ 1,384,622,000 | $ 2,160,302,000

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