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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | $ 215,142 | $ 250,061 | $ 230,682 | $ 246,159 |  |  |
Provision for loan losses | 4,408 | 1,030 | 709 | 5,843 |  |  |
Loans charged off | (11,073) | (5,825) | (29,068) | (10,850) |  |  |
Recoveries | 2,092 | 2,437 | 8,246 | 6,551 |  |  |
Ending balance | 210,569 | 247,703 | 210,569 | 247,703 |  |  |
Allowance for off-balance sheet credit losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2,433 | 6,431 | 3,734 | 11,244 |  |  |
Provision for off-balance sheet credit losses | (408) | (1,030) | (1,709) | (5,843) |  |  |
Ending balance | 2,025 | 5,401 | 2,025 | 5,401 |  |  |
Total provision for credit losses | 4,000 | 0 | (1,000) | 0 |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | $ 18,196,467 | $ 16,965,550 | $ 16,981,198
Individually measured for impairment, recorded investment |  |  |  |  | 152,992 | 187,874 | 225,636
Total |  |  |  |  | 18,349,459 | 17,153,424 | 17,206,834
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 177,882 | 199,634 | 206,341
Individually measured for impairment, related allowance |  |  |  |  | 13,797 | 8,831 | 13,284
Total | 215,142 | 250,061 | 210,569 | 246,159 | 210,569 | 230,682 | 247,703
Commercial [Member] |  |  |  |  |  |  |
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 113,722 | 137,742 | 124,269 | 140,213 |  |  |
Provision for loan losses | (1,285) | 2,474 | 2,720 | 665 |  |  |
Loans charged off | (9,602) | (4,429) | (24,940) | (6,556) |  |  |
Recoveries | 1,263 | 1,014 | 2,049 | 2,479 |  |  |
Ending balance | 104,098 | 136,801 | 104,098 | 136,801 |  |  |
Allowance for off-balance sheet credit losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2,361 | 6,301 | 3,644 | 11,063 |  |  |
Provision for off-balance sheet credit losses | (424) | (976) | (1,707) | (5,738) |  |  |
Ending balance | 1,937 | 5,325 | 1,937 | 5,325 |  |  |
Total provision for credit losses | (1,709) | 1,498 | 1,013 | (5,073) |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | 11,466,611 | 10,596,672 | 10,619,034
Individually measured for impairment, recorded investment |  |  |  |  | 109,490 | 137,303 | 176,900
Total |  |  |  |  | 11,576,101 | 10,733,975 | 10,795,934
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 90,301 | 115,438 | 123,517
Individually measured for impairment, related allowance |  |  |  |  | 13,797 | 8,831 | 13,284
Total | 113,722 | 137,742 | 124,269 | 136,801 | 104,098 | 124,269 | 136,801
Commercial real estate [Member] |  |  |  |  |  |  |
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 58,758 | 58,580 | 56,621 | 50,749 |  |  |
Provision for loan losses | 1,391 | (2,914) | 248 | 4,050 |  |  |
Loans charged off | 0 | 0 | 0 | (76) |  |  |
Recoveries | 40 | 739 | 3,320 | 1,682 |  |  |
Ending balance | 60,189 | 56,405 | 60,189 | 56,405 |  |  |
Allowance for off-balance sheet credit losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 17 | 84 | 45 | 123 |  |  |
Provision for off-balance sheet credit losses | 19 | (49) | (9) | (88) |  |  |
Ending balance | 36 | 35 | 36 | 35 |  |  |
Total provision for credit losses | 1,410 | (2,963) | 239 | 3,962 |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | 3,803,359 | 3,477,132 | 3,515,167
Individually measured for impairment, recorded investment |  |  |  |  | 1,316 | 2,855 | 2,975
Total |  |  |  |  | 3,804,675 | 3,479,987 | 3,518,142
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 60,189 | 56,621 | 56,405
Individually measured for impairment, related allowance |  |  |  |  | 0 | 0 | 0
Total | 58,758 | 58,580 | 56,621 | 50,749 | 60,189 | 56,621 | 56,405
Residential mortgage [Member] |  |  |  |  |  |  |
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 18,544 | 18,259 | 18,451 | 18,224 |  |  |
Provision for loan losses | 1 | 168 | (418) | 82 |  |  |
Loans charged off | (91) | (168) | (326) | (444) |  |  |
Recoveries | 229 | 134 | 976 | 531 |  |  |
Ending balance | 18,683 | 18,393 | 18,683 | 18,393 |  |  |
Allowance for off-balance sheet credit losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 53 | 38 | 43 | 50 |  |  |
Provision for off-balance sheet credit losses | (3) | 1 | 7 | (11) |  |  |
Ending balance | 50 | 39 | 50 | 39 |  |  |
Total provision for credit losses | (2) | 169 | (411) | 71 |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | 1,929,825 | 1,926,239 | 1,900,244
Individually measured for impairment, recorded investment |  |  |  |  | 41,917 | 47,447 | 45,506
Total |  |  |  |  | 1,971,742 | 1,973,686 | 1,945,750
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 18,683 | 18,451 | 18,393
Individually measured for impairment, related allowance |  |  |  |  | 0 | 0 | 0
Total | 18,544 | 18,259 | 18,683 | 18,224 | 18,683 | 18,451 | 18,393
Personal [Member] |  |  |  |  |  |  |
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 8,646 | 8,106 | 9,124 | 8,773 |  |  |
Provision for loan losses | 883 | 598 | 1,486 | 1,168 |  |  |
Loans charged off | (1,380) | (1,228) | (3,802) | (3,774) |  |  |
Recoveries | 560 | 550 | 1,901 | 1,859 |  |  |
Ending balance | 8,709 | 8,026 | 8,709 | 8,026 |  |  |
Allowance for off-balance sheet credit losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2 | 8 | 2 | 8 |  |  |
Provision for off-balance sheet credit losses | 0 | (6) | 0 | (6) |  |  |
Ending balance | 2 | 2 | 2 | 2 |  |  |
Total provision for credit losses | 883 | 592 | 1,486 | 1,162 |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | 996,672 | 965,507 | 946,753
Individually measured for impairment, recorded investment |  |  |  |  | 269 | 269 | 255
Total |  |  |  |  | 996,941 | 965,776 | 947,008
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 8,709 | 9,124 | 8,026
Individually measured for impairment, related allowance |  |  |  |  | 0 | 0 | 0
Total | 8,646 | 8,106 | 8,709 | 8,026 | 8,709 | 9,124 | 8,026
Specific Allowance [Member] |  |  |  |  |  |  |
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  | 208,465 |  |  |  |
Ending balance | 191,679 | 219,625 | 191,679 | 219,625 |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | 18,196,467 | 16,965,550 | 16,981,198
Individually measured for impairment, recorded investment |  |  |  |  | 152,992 | 187,874 | 225,636
Total |  |  |  |  | 18,349,459 | 17,153,424 | 17,206,834
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 177,882 | 199,634 | 206,341
Individually measured for impairment, related allowance |  |  |  |  | 13,797 | 8,831 | 13,284
Total | 191,679 | 219,625 | 191,679 | 219,625 | 191,679 | 208,465 | 219,625
Nonspecific Allowance [Member] |  |  |  |  |  |  |
Allowance for loan losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 15,472 | 27,374 | 22,217 | 28,200 |  |  |
Provision for loan losses | 3,418 | 704 | (3,327) | (122) |  |  |
Loans charged off | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 0 | 0 |  |  |
Ending balance | 18,890 | 28,078 | 18,890 | 28,078 |  |  |
Allowance for off-balance sheet credit losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 |  |  |
Provision for off-balance sheet credit losses | 0 | 0 | 0 | 0 |  |  |
Ending balance | 0 | 0 | 0 | 0 |  |  |
Total provision for credit losses | 3,418 | 704 | (3,327) | (122) |  |  |
Recorded investment [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, recorded investment |  |  |  |  | 0 | 0 | 0
Individually measured for impairment, recorded investment |  |  |  |  | 0 | 0 | 0
Total |  |  |  |  | 0 | 0 | 0
Related allowance [Abstract] |  |  |  |  |  |  |
Collectively measured for impairment, related allowance |  |  |  |  | 0 | 0 | 0
Individually measured for impairment, related allowance |  |  |  |  | 0 | 0 | 0
Total | $ 15,472 | $ 27,374 | $ 22,217 | $ 28,078 | $ 18,890 | $ 22,217 | $ 28,078

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