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Loans and Allowance for Loan Losses (Allowance for Loan Losses by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 181,179 | $ 128,762 |  |
Allowance for loan losses: Net provision for loan losses | $ 18,972 | $ 10,080 | 96,204 | 22,842 |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  | (3,027) | (1,984) |  |
Allowance for loan losses: Ending balance | 236,061 | 139,576 | 236,061 | 139,576 |  |
Allowance for loan losses: Individually evaluated for impairment | 21,130 | 8,618 | 21,130 | 8,618 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 19,708 | 25,505 | 19,708 | 25,505 |  |
Allowance for loan losses: Collectively evaluated for impairment | 195,223 | 105,453 | 195,223 | 105,453 |  |
Loans: Individually evaluated for impairment | 256,563 | 112,443 | 256,563 | 112,443 |  |
Loans: Purchased credit impaired loans | 201,792 | 249,905 | 201,792 | 249,905 | $ 225,838 | $ 313,685
Loans: Collectively evaluated for impairment | 15,612,466 | 14,400,702 | 15,612,466 | 14,400,702 |  |
Loans: Total loans | 16,070,821 | 14,763,050 | 16,070,821 | 14,763,050 | 15,703,314 |
Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Total loans | 11,972,654 |  | 11,972,654 |  | 11,560,325 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 6,041 | 7,546 |  |
Allowance for loan losses: Ending balance | 10,950 | 5,133 | 10,950 | 5,133 |  |
Allowance for loan losses: Individually evaluated for impairment | 57 | 187 | 57 | 187 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 279 | 885 | 279 | 885 |  |
Allowance for loan losses: Collectively evaluated for impairment | 10,614 | 4,061 | 10,614 | 4,061 |  |
Loans: Individually evaluated for impairment | 7,655 | 12,520 | 7,655 | 12,520 |  |
Loans: Purchased credit impaired loans | 8,087 | 15,280 | 8,087 | 15,280 |  |
Loans: Collectively evaluated for impairment | 1,974,567 | 1,456,432 | 1,974,567 | 1,456,432 |  |
Loans: Total loans | 1,990,309 | 1,484,232 | 1,990,309 | 1,484,232 | 1,553,082 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 5,642 | 6,421 |  |
Allowance for loan losses: Ending balance | 5,848 | 7,374 | 5,848 | 7,374 |  |
Allowance for loan losses: Individually evaluated for impairment | 6 | 21 | 6 | 21 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 484 | 1,727 | 484 | 1,727 |  |
Allowance for loan losses: Collectively evaluated for impairment | 5,358 | 5,626 | 5,358 | 5,626 |  |
Loans: Individually evaluated for impairment | 2,062 | 2,053 | 2,062 | 2,053 |  |
Loans: Purchased credit impaired loans | 8,436 | 16,336 | 8,436 | 16,336 |  |
Loans: Collectively evaluated for impairment | 936,094 | 1,067,196 | 936,094 | 1,067,196 |  |
Loans: Total loans | 946,592 | 1,085,585 | 946,592 | 1,085,585 | 1,151,950 |
Residential Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 25,353 | 28,660 |  |
Allowance for loan losses: Ending balance | 24,192 | 25,790 | 24,192 | 25,790 |  |
Allowance for loan losses: Individually evaluated for impairment | 94 | 96 | 94 | 96 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 15,949 | 18,329 | 15,949 | 18,329 |  |
Allowance for loan losses: Collectively evaluated for impairment | 8,149 | 7,365 | 8,149 | 7,365 |  |
Loans: Individually evaluated for impairment | 3,864 | 903 | 3,864 | 903 |  |
Loans: Purchased credit impaired loans | 145,273 | 170,033 | 145,273 | 170,033 |  |
Loans: Collectively evaluated for impairment | 1,888,025 | 1,842,853 | 1,888,025 | 1,842,853 |  |
Loans: Total loans | 2,037,162 | 2,013,789 | 2,037,162 | 2,013,789 | 2,049,524 |
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 24,857 | 21,430 |  |
Allowance for loan losses: Ending balance | 25,027 | 23,252 | 25,027 | 23,252 |  |
Allowance for loan losses: Individually evaluated for impairment | 85 | 3 | 85 | 3 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 1,334 | 2,711 | 1,334 | 2,711 |  |
Allowance for loan losses: Collectively evaluated for impairment | 23,608 | 20,538 | 23,608 | 20,538 |  |
Loans: Individually evaluated for impairment | 1,485 | 157 | 1,485 | 157 |  |
Loans: Purchased credit impaired loans | 12,045 | 13,424 | 12,045 | 13,424 |  |
Loans: Collectively evaluated for impairment | 2,047,475 | 1,976,715 | 2,047,475 | 1,976,715 |  |
Loans: Total loans | 2,061,005 | 1,990,296 | 2,061,005 | 1,990,296 | 2,093,465 |
Purchased Credit Impaired [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (146) | (5,451) |  |
Allowance for loan losses: Recoveries |  |  | 484 | 3,742 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (723) | (1,386) |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  | (3,027) | (1,984) |  |
Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (1) | (2,353) |  |
Allowance for loan losses: Recoveries |  |  | 2 | 20 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (436) | 994 |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  |  | 919 |  |
Purchased Credit Impaired [Member] | Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (18) | (406) |  |
Allowance for loan losses: Recoveries |  |  | 98 | 896 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (253) | 235 |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  |  | (6) |  |
Purchased Credit Impaired [Member] | Residential Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (91) | (748) |  |
Allowance for loan losses: Recoveries |  |  | 33 | 5 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 1,685 | 1,181 |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  | (3,341) | (2,718) |  |
Purchased Credit Impaired [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (8) | (140) |  |
Allowance for loan losses: Recoveries |  |  | 112 | 185 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (1,633) | (1,232) |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  | 316 | (97) |  |
Non-Purchased Credit Impaired [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (48,493) | (17,561) |  |
Allowance for loan losses: Recoveries |  |  | 9,860 | 9,226 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 96,927 | 24,228 |  |
Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (191) | (464) |  |
Allowance for loan losses: Recoveries |  |  | 673 | 386 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 4,862 | (1,915) |  |
Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (827) | (1,483) |  |
Allowance for loan losses: Recoveries |  |  | 1,422 | 2,006 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (216) | (289) |  |
Non-Purchased Credit Impaired [Member] | Residential Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (908) | (1,451) |  |
Allowance for loan losses: Recoveries |  |  | 497 | 578 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 964 | 283 |  |
Non-Purchased Credit Impaired [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (17,403) | (10,431) |  |
Allowance for loan losses: Recoveries |  |  | 4,272 | 3,418 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 14,514 | 10,119 |  |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 119,286 | 64,705 |  |
Allowance for loan losses: Ending balance | 170,044 | 78,027 | 170,044 | 78,027 |  |
Allowance for loan losses: Individually evaluated for impairment | 20,888 | 8,311 | 20,888 | 8,311 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 1,662 | 1,853 | 1,662 | 1,853 |  |
Allowance for loan losses: Collectively evaluated for impairment | 147,494 | 67,863 | 147,494 | 67,863 |  |
Loans: Individually evaluated for impairment | 241,497 | 96,810 | 241,497 | 96,810 |  |
Loans: Purchased credit impaired loans | 27,951 | 34,832 | 27,951 | 34,832 |  |
Loans: Collectively evaluated for impairment | 8,766,305 | 8,057,506 | 8,766,305 | 8,057,506 |  |
Loans: Total loans | 9,035,753 | 8,189,148 | 9,035,753 | 8,189,148 | 8,855,293 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 109,428 | 51,169 |  |
Allowance for loan losses: Ending balance | 159,261 | 63,922 | 159,261 | 63,922 |  |
Allowance for loan losses: Individually evaluated for impairment | 20,665 | 5,588 | 20,665 | 5,588 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 574 | 549 | 574 | 549 |  |
Allowance for loan losses: Collectively evaluated for impairment | 138,022 | 57,785 | 138,022 | 57,785 |  |
Loans: Individually evaluated for impairment | 235,039 | 75,345 | 235,039 | 75,345 |  |
Loans: Purchased credit impaired loans | 11,534 | 13,158 | 11,534 | 13,158 |  |
Loans: Collectively evaluated for impairment | 6,887,355 | 6,257,491 | 6,887,355 | 6,257,491 |  |
Loans: Total loans | 7,133,928 | 6,345,994 | 7,133,928 | 6,345,994 | 6,995,824 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 9,858 | 13,536 |  |
Allowance for loan losses: Ending balance | 10,783 | 14,105 | 10,783 | 14,105 |  |
Allowance for loan losses: Individually evaluated for impairment | 223 | 2,723 | 223 | 2,723 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 1,088 | 1,304 | 1,088 | 1,304 |  |
Allowance for loan losses: Collectively evaluated for impairment | 9,472 | 10,078 | 9,472 | 10,078 |  |
Loans: Individually evaluated for impairment | 6,458 | 21,465 | 6,458 | 21,465 |  |
Loans: Purchased credit impaired loans | 16,417 | 21,674 | 16,417 | 21,674 |  |
Loans: Collectively evaluated for impairment | 1,878,950 | 1,800,015 | 1,878,950 | 1,800,015 |  |
Loans: Total loans | $ 1,901,825 | $ 1,843,154 | 1,901,825 | 1,843,154 | $ 1,859,469 |
Total Commercial & Industrial [Member] | Purchased Credit Impaired [Member] | Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (28) | (1,804) |  |
Allowance for loan losses: Recoveries |  |  | 239 | 2,636 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (86) | (2,564) |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  | (2) | (82) |  |
Total Commercial & Industrial [Member] | Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  |  | (1,425) |  |
Allowance for loan losses: Recoveries |  |  | 76 | 1,699 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 54 | (950) |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  | (2) | 314 |  |
Total Commercial & Industrial [Member] | Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (28) | (379) |  |
Allowance for loan losses: Recoveries |  |  | 163 | 937 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (140) | (1,614) |  |
Allowance for loan losses: Increase (decrease) in FDIC loss share receivable |  |  |  | (396) |  |
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired [Member] | Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (29,164) | (3,732) |  |
Allowance for loan losses: Recoveries |  |  | 2,996 | 2,838 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 76,803 | 16,030 |  |
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (27,504) | (3,068) |  |
Allowance for loan losses: Recoveries |  |  | 2,709 | 2,589 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 74,500 | 13,594 |  |
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (1,660) | (664) |  |
Allowance for loan losses: Recoveries |  |  | 287 | 249 |  |
Allowance for loan losses: Net provision for loan losses |  |  | $ 2,303 | $ 2,436 |  |

X
- Definition Amount before allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including loans and leases covered under loss sharing agreements. + References No definition available. + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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