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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | $ 204,466 | $ 233,394 | $ 319,018 |  |  |  |
Reclassification |  | 0 | 0 | 7,368 | [1] |  |  |
Provisions |  | 20,664 | 640 | (32,255) |  |  |  |
Charge-offs |  | (28,348) | (37,770) | (68,026) |  |  |  |
Recoveries |  | 9,434 | 8,202 | 7,289 |  |  |  |
Net charge-offs |  | (18,914) | (29,568) | (60,737) |  |  |  |
Ending balance |  | 206,216 | 204,466 | 233,394 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 204,466 | 233,394 | 319,018 |  | $ 206,216 | $ 204,466 | $ 233,394
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Net Loans and Leases |  |  |  |  |  | 20,033,774 | 18,564,999 |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases acquired with deteriorated credit quality |  |  |  |  |  | 206,216 | 204,466 |
PCI Loans |  |  |  |  |  | 950,516 | 1,186,498 | 1,029,426
Commercial |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 593,614 | 726,123 |
Commercial | Construction and land development |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 33,880 | 78,079 |
Commercial | Mortgage |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 525,468 | 577,518 |
Commercial | Other commercial real estate |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 17,076 | 40,193 |
Commercial | Commercial and industrial |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 15,182 | 27,254 |
Commercial | Other |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 2,008 | 3,079 |
Commercial | Consumer and Other |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 2,008 | 3,079 |
Noncommercial |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Reclassification |  | 7,368 |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 356,902 | 460,375 |
Noncommercial | Construction and land development |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 0 | 912 |
Noncommercial | Mortgage |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 302,158 | 382,340 |
Noncommercial | Revolving mortgage |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 52,471 | 74,109 |
Noncommercial | Consumer |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 2,273 | 3,014 |
Noncommercial | Non-specific |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Reclassification |  | (15,772) |  |  |  |  |  |
Non-PCI Loans |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 182,837 | 179,874 | 179,046 |  |  |  |
Reclassification | [1] |  |  | 7,368 |  |  |  |
Provisions |  | 22,937 | 15,260 | 19,289 |  |  |  |
Charge-offs |  | (25,304) | (20,499) | (33,118) |  |  |  |
Recoveries |  | 9,434 | 8,202 | 7,289 |  |  |  |
Net charge-offs |  | (15,870) | (12,297) | (25,829) |  |  |  |
Ending balance |  | 189,904 | 182,837 | 179,874 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 7,200 | 15,717 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 182,704 | 167,120 |
Total allowance for loan and lease losses |  | 182,837 | 179,874 | 179,046 |  | 189,904 | 182,837 | 179,874
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 150,367 | 119,593 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 19,139,107 | 17,463,074 |
Net Loans and Leases |  |  |  |  |  | 19,289,474 | 17,582,667 |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 11,961 | 10,335 | 6,031 |  |  |  |
Reclassification | [1] |  |  | 5,141 |  |  |  |
Provisions |  | 4,773 | 1,735 | 2,809 |  |  |  |
Charge-offs |  | (1,012) | (316) | (4,685) |  |  |  |
Recoveries |  | 566 | 207 | 1,039 |  |  |  |
Ending balance |  | 16,288 | 11,961 | 10,335 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 123 | 92 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 16,165 | 11,869 |
Total allowance for loan and lease losses |  | 11,961 | 10,335 | 6,031 |  | 16,288 | 11,961 | 10,335
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 3,094 | 1,620 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 617,258 | 491,513 |
Net Loans and Leases |  |  |  |  |  | 620,352 | 493,133 |
Non-PCI Loans | Commercial | Mortgage |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 85,189 | 100,257 | 80,229 |  |  |  |
Reclassification | [1] |  |  | 27,421 |  |  |  |
Provisions |  | (15,822) | (16,746) | (4,485) |  |  |  |
Charge-offs |  | (1,498) | (1,147) | (3,904) |  |  |  |
Recoveries |  | 2,027 | 2,825 | 996 |  |  |  |
Ending balance |  | 69,896 | 85,189 | 100,257 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 3,370 | 8,610 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 66,526 | 76,579 |
Total allowance for loan and lease losses |  | 85,189 | 100,257 | 80,229 |  | 69,896 | 85,189 | 100,257
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 95,107 | 82,803 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 8,179,441 | 7,470,145 |
Net Loans and Leases |  |  |  |  |  | 8,274,548 | 7,552,948 |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 732 | 1,009 | 2,059 |  |  |  |
Reclassification | [1] |  |  | (815) |  |  |  |
Provisions |  | 1,569 | (401) | (32) |  |  |  |
Charge-offs |  | (178) | 0 | (312) |  |  |  |
Recoveries |  | 45 | 124 | 109 |  |  |  |
Ending balance |  | 2,168 | 732 | 1,009 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 289 | 112 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 1,879 | 620 |
Total allowance for loan and lease losses |  | 732 | 1,009 | 2,059 |  | 2,168 | 732 | 1,009
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 427 | 584 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 320,594 | 244,291 |
Net Loans and Leases |  |  |  |  |  | 321,021 | 244,875 |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 30,727 | 22,362 | 14,050 |  |  |  |
Reclassification | [1] |  |  | 7,551 |  |  |  |
Provisions |  | 17,432 | 10,441 | 4,333 |  |  |  |
Charge-offs |  | (5,952) | (3,014) | (4,785) |  |  |  |
Recoveries |  | 909 | 938 | 1,213 |  |  |  |
Ending balance |  | 43,116 | 30,727 | 22,362 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 1,118 | 1,743 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 41,998 | 28,984 |
Total allowance for loan and lease losses |  | 30,727 | 22,362 | 14,050 |  | 43,116 | 30,727 | 22,362
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 17,910 | 11,040 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 2,351,048 | 1,977,594 |
Net Loans and Leases |  |  |  |  |  | 2,368,958 | 1,988,634 |
Non-PCI Loans | Commercial | Lease financing |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 4,286 | 4,749 | 3,521 |  |  |  |
Reclassification | [1] |  |  | (253) |  |  |  |
Provisions |  | 1,602 | (473) | 1,646 |  |  |  |
Charge-offs |  | (402) | (100) | (272) |  |  |  |
Recoveries |  | 38 | 110 | 107 |  |  |  |
Ending balance |  | 5,524 | 4,286 | 4,749 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 213 | 150 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 5,311 | 4,136 |
Total allowance for loan and lease losses |  | 4,286 | 4,749 | 3,521 |  | 5,524 | 4,286 | 4,749
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 1,755 | 623 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 729,023 | 571,293 |
Net Loans and Leases |  |  |  |  |  | 730,778 | 571,916 |
Non-PCI Loans | Commercial | Other |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 3,184 | 190 | 1,175 |  |  |  |
Reclassification | [1] |  |  | (1,288) |  |  |  |
Provisions |  | (1,420) | 3,007 | 308 |  |  |  |
Charge-offs |  | 0 | (13) | (6) |  |  |  |
Recoveries |  | 91 | 0 | 1 |  |  |  |
Ending balance |  | 1,855 | 3,184 | 190 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 0 | 1,972 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 1,855 | 1,212 |
Total allowance for loan and lease losses |  | 3,184 | 190 | 1,175 |  | 1,855 | 3,184 | 190
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 1,183 | 2,000 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 313,649 | 351,833 |
Net Loans and Leases |  |  |  |  |  | 314,832 | 353,833 |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 892 | 681 | 1,721 |  |  |  |
Reclassification | [1] |  |  | (478) |  |  |  |
Provisions |  | 541 | 245 | (379) |  |  |  |
Charge-offs |  | (22) | (118) | (392) |  |  |  |
Recoveries |  | 74 | 84 | 209 |  |  |  |
Ending balance |  | 1,485 | 892 | 681 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 49 | 71 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 1,436 | 821 |
Total allowance for loan and lease losses |  | 892 | 681 | 1,721 |  | 1,485 | 892 | 681
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 784 | 1,340 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 219,289 | 203,676 |
Net Loans and Leases |  |  |  |  |  | 220,073 | 205,016 |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 10,661 | 10,511 | 3,836 |  |  |  |
Reclassification | [1] |  |  | 5,717 |  |  |  |
Provisions |  | 4,202 | 1,219 | 2,786 |  |  |  |
Charge-offs |  | (1,619) | (1,260) | (2,387) |  |  |  |
Recoveries |  | 861 | 191 | 559 |  |  |  |
Ending balance |  | 14,105 | 10,661 | 10,511 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 1,212 | 1,360 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 12,893 | 9,301 |
Total allowance for loan and lease losses |  | 10,661 | 10,511 | 3,836 |  | 14,105 | 10,661 | 10,511
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 22,986 | 14,913 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 2,672,999 | 2,478,145 |
Net Loans and Leases |  |  |  |  |  | 2,695,985 | 2,493,058 |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 18,650 | 16,239 | 25,185 |  |  |  |
Reclassification | [1] |  |  | (9,838) |  |  |  |
Provisions |  | (927) | 6,301 | 6,296 |  |  |  |
Charge-offs |  | (2,925) | (4,744) | (6,064) |  |  |  |
Recoveries |  | 1,173 | 854 | 660 |  |  |  |
Ending balance |  | 15,971 | 18,650 | 16,239 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 299 | 1,052 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 15,672 | 17,598 |
Total allowance for loan and lease losses |  | 18,650 | 16,239 | 25,185 |  | 15,971 | 18,650 | 16,239
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 5,883 | 3,675 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 2,517,223 | 2,558,125 |
Net Loans and Leases |  |  |  |  |  | 2,523,106 | 2,561,800 |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 16,555 | 13,541 | 25,389 |  |  |  |
Reclassification | [1] |  |  | (10,018) |  |  |  |
Provisions |  | 10,987 | 9,932 | 6,085 |  |  |  |
Charge-offs |  | (11,696) | (9,787) | (10,311) |  |  |  |
Recoveries |  | 3,650 | 2,869 | 2,396 |  |  |  |
Ending balance |  | 19,496 | 16,555 | 13,541 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  |  |  | 527 | 555 |
ALLL for loans and leases collectively evaluated for impairment |  |  |  |  |  | 18,969 | 16,000 |
Total allowance for loan and lease losses |  | 16,555 | 13,541 | 25,389 |  | 19,496 | 16,555 | 13,541
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  |  |  | 1,238 | 995 |
Loans and leases collectively evaluated for impairment |  |  |  |  |  | 1,218,583 | 1,116,459 |
Net Loans and Leases |  |  |  |  |  | 1,219,821 | 1,117,454 |
Non-PCI Loans | Noncommercial | Non-specific |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 | 0 | 15,850 |  |  |  |
Reclassification | [1] |  |  | (15,772) |  |  |  |
Provisions |  | 0 | 0 | (78) |  |  |  |
Charge-offs |  | 0 | 0 | 0 |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 0 | 0 | 0 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 0 | 0 | 15,850 |  | 0 | 0 | 0
PCI Loans |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 21,629 | 53,520 | 139,972 |  |  |  |
Reclassification | [1] |  |  | 0 |  |  |  |
Provisions |  | (2,273) | (14,620) | (51,544) |  |  |  |
Charge-offs |  | (3,044) | (17,271) | (34,908) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Net charge-offs |  | (3,044) | (17,271) | (34,908) |  |  |  |
Ending balance |  | 16,312 | 21,629 | 53,520 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 21,629 | 53,520 | 139,972 |  | 16,312 | 21,629 | 53,520
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  |  | 1,186,498 |
PCI Loans | Commercial | Construction and land development |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 150 | 1,320 | 31,186 |  |  |  |
Provisions |  | 1,029 | 1,284 | (22,942) |  |  |  |
Charge-offs |  | (97) | (2,454) | (6,924) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 1,082 | 150 | 1,320 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 150 | 1,320 | 31,186 |  | 1,082 | 150 | 1,320
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 33,880 | 78,079 |
PCI Loans | Commercial | Mortgage |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 10,135 | 29,906 | 50,275 |  |  |  |
Provisions |  | (1,426) | (7,903) | (3,872) |  |  |  |
Charge-offs |  | (871) | (11,868) | (16,497) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 7,838 | 10,135 | 29,906 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 10,135 | 29,906 | 50,275 |  | 7,838 | 10,135 | 29,906
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 525,468 | 577,518 |
PCI Loans | Commercial | Other commercial real estate |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 75 | 1,354 | 11,234 |  |  |  |
Provisions |  | 698 | (1,385) | (8,949) |  |  |  |
Charge-offs |  | 0 | (106) | (931) |  |  |  |
Recoveries |  | 0 | 0 |  |  |  |  |
Ending balance |  | 773 | 75 | 1,354 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 75 | 1,354 | 11,234 |  | 773 | 75 | 1,354
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 17,076 | 40,193 |
PCI Loans | Commercial | Commercial and industrial |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 1,240 | 5,275 | 8,897 |  |  |  |
Provisions |  | (470) | (2,023) | 470 |  |  |  |
Charge-offs |  | (325) | (2,012) | (4,092) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 445 | 1,240 | 5,275 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 1,240 | 5,275 | 8,897 |  | 445 | 1,240 | 5,275
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 15,182 | 27,254 |
PCI Loans | Noncommercial |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 356,902 | 460,375 |
PCI Loans | Noncommercial | Construction and land development |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 183 | 682 | 8,287 |  |  |  |
Provisions |  | (183) | (395) | (4,170) |  |  |  |
Charge-offs |  | 0 | (104) | (3,435) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 0 | 183 | 682 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 183 | 682 | 8,287 |  | 0 | 183 | 682
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 0 | 912 |
PCI Loans | Noncommercial | Mortgage |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 5,820 | 11,802 | 19,837 |  |  |  |
Provisions |  | 72 | (5,576) | (5,487) |  |  |  |
Charge-offs |  | (494) | (406) | (2,548) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 5,398 | 5,820 | 11,802 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 5,820 | 11,802 | 19,837 |  | 5,398 | 5,820 | 11,802
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 302,158 | 382,340 |
PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 3,999 | 2,959 | 9,754 |  |  |  |
Provisions |  | (2,720) | 1,523 | (6,399) |  |  |  |
Charge-offs |  | (756) | (483) | (396) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 523 | 3,999 | 2,959 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | 3,999 | 2,959 | 9,754 |  | 523 | 3,999 | 2,959
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 52,471 | 74,109 |
PCI Loans | Noncommercial | Consumer |  |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | 2,273 | 3,014 |
PCI Loans | Noncommercial | Consumer and Other |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 27 | 222 | 502 |  |  |  |
Provisions |  | 727 | (145) | (195) |  |  |  |
Charge-offs |  | (501) | (50) | (85) |  |  |  |
Recoveries |  | 0 | 0 | 0 |  |  |  |
Ending balance |  | 253 | 27 | 222 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |  |
Total allowance for loan and lease losses |  | $ 27 | $ 222 | $ 502 |  | 253 | 27 | $ 222
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |  |
PCI Loans |  |  |  |  |  | $ 4,281 | $ 6,093 |
[1] | Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.

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