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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 217,308 | $ 229,418 |
Allowance for loan losses: Net provision for loan losses | $ 6,872 | $ 13,040 | 28,016 | 43,982 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  | (2,526) |
Reduction as a result of sale of subsidiary |  |  | (6,648) |  |
Allowance for loan losses: Ending balance | 214,550 | 223,122 | 214,550 | 223,122 |
Allowance for loan losses: Individually evaluated for impairment | 23,906 | 23,490 | 23,906 | 23,490 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 11,408 | 15,312 | 11,408 | 15,312 |
Allowance for loan losses: Collectively evaluated for impairment | 179,236 | 184,320 | 179,236 | 184,320 |
Loans: Individually evaluated for impairment | 307,081 | 302,398 | 307,081 | 302,398 |
Loans: Purchased credit impaired loans | 135,035 | 176,111 | 135,035 | 176,111 |
Loans: Collectively evaluated for impairment | 19,101,601 | 18,307,776 | 19,101,601 | 18,307,776 |
Loans receivable | 19,543,717 | 18,786,285 | 19,543,717 | 18,786,285 | $ 19,004,163
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 13,709 | 13,509 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  |  |
Reduction as a result of sale of subsidiary |  |  |  |  |
Allowance for loan losses: Ending balance | 18,585 | 14,490 | 18,585 | 14,490 |
Allowance for loan losses: Individually evaluated for impairment | 285 | 1,321 | 285 | 1,321 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 45 | 199 | 45 | 199 |
Allowance for loan losses: Collectively evaluated for impairment | 18,255 | 12,970 | 18,255 | 12,970 |
Loans: Individually evaluated for impairment | 4,615 | 14,295 | 4,615 | 14,295 |
Loans: Purchased credit impaired loans | 3,790 | 5,353 | 3,790 | 5,353 |
Loans: Collectively evaluated for impairment | 2,303,294 | 2,492,160 | 2,303,294 | 2,492,160 |
Loans receivable | 2,311,699 | 2,511,808 | 2,311,699 | 2,511,808 | 2,384,599
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 7,372 | 6,271 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  |  |
Reduction as a result of sale of subsidiary |  |  |  |  |
Allowance for loan losses: Ending balance | 13,423 | 6,581 | 13,423 | 6,581 |
Allowance for loan losses: Individually evaluated for impairment | 1 | 1 | 1 | 1 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 91 | 254 | 91 | 254 |
Allowance for loan losses: Collectively evaluated for impairment | 13,331 | 6,326 | 13,331 | 6,326 |
Loans: Individually evaluated for impairment | 112 | 480 | 112 | 480 |
Loans: Purchased credit impaired loans | 4,232 | 6,670 | 4,232 | 6,670 |
Loans: Collectively evaluated for impairment | 1,519,075 | 1,365,898 | 1,519,075 | 1,365,898 |
Loans receivable | 1,523,419 | 1,373,048 | 1,523,419 | 1,373,048 | 1,373,421
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 24,844 | 25,361 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  | (2,344) |
Reduction as a result of sale of subsidiary |  |  |  |  |
Allowance for loan losses: Ending balance | 24,310 | 25,034 | 24,310 | 25,034 |
Allowance for loan losses: Individually evaluated for impairment | 163 | 406 | 163 | 406 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 10,109 | 12,795 | 10,109 | 12,795 |
Allowance for loan losses: Collectively evaluated for impairment | 14,038 | 11,833 | 14,038 | 11,833 |
Loans: Individually evaluated for impairment | 3,061 | 8,942 | 3,061 | 8,942 |
Loans: Purchased credit impaired loans | 107,535 | 123,244 | 107,535 | 123,244 |
Loans: Collectively evaluated for impairment | 2,736,320 | 2,464,506 | 2,736,320 | 2,464,506 |
Loans receivable | 2,846,916 | 2,596,692 | 2,846,916 | 2,596,692 | 2,690,472
Consumer [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 30,503 | 26,142 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  | (135) |
Reduction as a result of sale of subsidiary |  |  | (6,648) |  |
Allowance for loan losses: Ending balance | 24,437 | 29,363 | 24,437 | 29,363 |
Allowance for loan losses: Individually evaluated for impairment | 131 | 405 | 131 | 405 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 433 | 863 | 433 | 863 |
Allowance for loan losses: Collectively evaluated for impairment | 23,873 | 28,095 | 23,873 | 28,095 |
Loans: Individually evaluated for impairment | 890 | 1,306 | 890 | 1,306 |
Loans: Purchased credit impaired loans | 4,458 | 7,637 | 4,458 | 7,637 |
Loans: Collectively evaluated for impairment | 2,117,180 | 2,090,351 | 2,117,180 | 2,090,351 |
Loans receivable | 2,122,528 | 2,099,294 | 2,122,528 | 2,099,294 | 2,115,295
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (43,813) | (61,933) |
Allowance for loan losses: Recoveries |  |  | 19,687 | 14,181 |
Allowance for loan losses: Net provision for loan losses |  |  | 28,016 | 43,982 |
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (1,633) | (160) |
Allowance for loan losses: Recoveries |  |  | 221 | 655 |
Allowance for loan losses: Net provision for loan losses |  |  | 6,288 | 486 |
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (265) | (670) |
Allowance for loan losses: Recoveries |  |  | 68 | 1,050 |
Allowance for loan losses: Net provision for loan losses |  |  | 6,248 | (70) |
Non-Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (585) | (2,485) |
Allowance for loan losses: Recoveries |  |  | 1,854 | 339 |
Allowance for loan losses: Net provision for loan losses |  |  | (1,803) | 4,163 |
Non-Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (18,599) | (22,844) |
Allowance for loan losses: Recoveries |  |  | 4,028 | 5,248 |
Allowance for loan losses: Net provision for loan losses |  |  | 15,153 | 20,952 |
Total Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans receivable | 10,739,155 |  | 10,739,155 |  |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 140,880 | 158,135 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  | (47) |
Reduction as a result of sale of subsidiary |  |  |  |  |
Allowance for loan losses: Ending balance | 133,795 | 147,654 | 133,795 | 147,654 |
Allowance for loan losses: Individually evaluated for impairment | 23,326 | 21,357 | 23,326 | 21,357 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 730 | 1,201 | 730 | 1,201 |
Allowance for loan losses: Collectively evaluated for impairment | 109,739 | 125,096 | 109,739 | 125,096 |
Loans: Individually evaluated for impairment | 298,403 | 277,375 | 298,403 | 277,375 |
Loans: Purchased credit impaired loans | 15,020 | 33,207 | 15,020 | 33,207 |
Loans: Collectively evaluated for impairment | 10,425,732 | 9,894,861 | 10,425,732 | 9,894,861 |
Loans receivable | 10,739,155 | 10,205,443 | 10,739,155 | 10,205,443 | 10,440,376
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 127,918 | 147,052 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  | (47) |
Reduction as a result of sale of subsidiary |  |  |  |  |
Allowance for loan losses: Ending balance | 120,678 | 134,095 | 120,678 | 134,095 |
Allowance for loan losses: Individually evaluated for impairment | 23,101 | 20,880 | 23,101 | 20,880 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 327 | 417 | 327 | 417 |
Allowance for loan losses: Collectively evaluated for impairment | 97,250 | 112,798 | 97,250 | 112,798 |
Loans: Individually evaluated for impairment | 275,966 | 271,024 | 275,966 | 271,024 |
Loans: Purchased credit impaired loans | 7,907 | 20,186 | 7,907 | 20,186 |
Loans: Collectively evaluated for impairment | 8,155,011 | 7,838,219 | 8,155,011 | 7,838,219 |
Loans receivable | 8,438,884 | 8,129,429 | 8,438,884 | 8,129,429 | 8,297,937
Total Commercial And 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 |  |  | 12,962 | 11,083 |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  |  |
Reduction as a result of sale of subsidiary |  |  |  |  |
Allowance for loan losses: Ending balance | 13,117 | 13,559 | 13,117 | 13,559 |
Allowance for loan losses: Individually evaluated for impairment | 225 | 477 | 225 | 477 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 403 | 784 | 403 | 784 |
Allowance for loan losses: Collectively evaluated for impairment | 12,489 | 12,298 | 12,489 | 12,298 |
Loans: Individually evaluated for impairment | 22,437 | 6,351 | 22,437 | 6,351 |
Loans: Purchased credit impaired loans | 7,113 | 13,021 | 7,113 | 13,021 |
Loans: Collectively evaluated for impairment | 2,270,721 | 2,056,642 | 2,270,721 | 2,056,642 |
Loans receivable | $ 2,300,271 | $ 2,076,014 | 2,300,271 | 2,076,014 | $ 2,142,439
Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (22,731) | (35,774) |
Allowance for loan losses: Recoveries |  |  | 13,516 | 6,889 |
Allowance for loan losses: Net provision for loan losses |  |  | 2,130 | 18,451 |
Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (15,401) | (35,247) |
Allowance for loan losses: Recoveries |  |  | 13,234 | 6,442 |
Allowance for loan losses: Net provision for loan losses |  |  | (5,073) | 15,895 |
Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (7,330) | (527) |
Allowance for loan losses: Recoveries |  |  | 282 | 447 |
Allowance for loan losses: Net provision for loan losses |  |  | $ 7,203 | $ 2,556 |

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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=82894903&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=82894507&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=82894903&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=82894507&loc=d3e13503-111538 + Details
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