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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 229,418 | $ 181,179 |  |
Allowance for loan losses: Net provision for loan losses | $ 13,040 | $ 18,972 | 43,982 | 96,204 |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  | (2,526) | (3,027) |  |
Allowance for loan losses: Ending balance | 223,122 | 236,061 | 223,122 | 236,061 |  |
Allowance for loan losses: Individually evaluated for impairment | 23,490 | 21,130 | 23,490 | 21,130 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 15,312 | 19,708 | 15,312 | 19,708 |  |
Allowance for loan losses: Collectively evaluated for impairment | 184,320 | 195,223 | 184,320 | 195,223 |  |
Loans: Individually evaluated for impairment | 302,397 | 256,563 | 302,397 | 256,563 |  |
Loans: Purchased credit impaired loans | 176,111 | 201,792 | 176,111 | 201,792 | $ 190,915 | $ 225,838
Loans: Collectively evaluated for impairment | 18,307,777 | 15,612,466 | 18,307,777 | 15,612,466 |  |
Loans receivable | 18,786,285 | 16,070,821 | 18,786,285 | 16,070,821 | 16,752,151 |
Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans receivable | 14,090,299 |  | 14,090,299 |  | 12,545,507 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 13,509 | 6,041 |  |
Allowance for loan losses: Ending balance | 14,490 | 10,950 | 14,490 | 10,950 |  |
Allowance for loan losses: Individually evaluated for impairment | 1,321 | 57 | 1,321 | 57 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 199 | 279 | 199 | 279 |  |
Allowance for loan losses: Collectively evaluated for impairment | 12,970 | 10,614 | 12,970 | 10,614 |  |
Loans: Individually evaluated for impairment | 14,295 | 7,655 | 14,295 | 7,655 |  |
Loans: Purchased credit impaired loans | 5,353 | 8,087 | 5,353 | 8,087 |  |
Loans: Collectively evaluated for impairment | 2,492,160 | 1,974,567 | 2,492,160 | 1,974,567 |  |
Loans receivable | 2,511,808 | 1,990,309 | 2,511,808 | 1,990,309 | 2,013,890 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 6,271 | 5,642 |  |
Allowance for loan losses: Ending balance | 6,581 | 5,848 | 6,581 | 5,848 |  |
Allowance for loan losses: Individually evaluated for impairment | 1 | 6 | 1 | 6 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 254 | 484 | 254 | 484 |  |
Allowance for loan losses: Collectively evaluated for impairment | 6,326 | 5,358 | 6,326 | 5,358 |  |
Loans: Individually evaluated for impairment | 480 | 2,062 | 480 | 2,062 |  |
Loans: Purchased credit impaired loans | 6,670 | 8,436 | 6,670 | 8,436 |  |
Loans: Collectively evaluated for impairment | 1,365,898 | 936,094 | 1,365,898 | 936,094 |  |
Loans receivable | 1,373,048 | 946,592 | 1,373,048 | 946,592 | 1,010,879 |
Residential Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 25,361 | 25,353 |  |
Allowance for loan losses: Ending balance | 25,034 | 24,192 | 25,034 | 24,192 |  |
Allowance for loan losses: Individually evaluated for impairment | 406 | 94 | 406 | 94 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 12,795 | 15,949 | 12,795 | 15,949 |  |
Allowance for loan losses: Collectively evaluated for impairment | 11,833 | 8,149 | 11,833 | 8,149 |  |
Loans: Individually evaluated for impairment | 8,942 | 3,864 | 8,942 | 3,864 |  |
Loans: Purchased credit impaired loans | 123,244 | 145,273 | 123,244 | 145,273 |  |
Loans: Collectively evaluated for impairment | 2,464,506 | 1,888,025 | 2,464,506 | 1,888,025 |  |
Loans receivable | 2,596,692 | 2,037,162 | 2,596,692 | 2,037,162 | 2,146,713 |
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 26,142 | 24,857 |  |
Allowance for loan losses: Ending balance | 29,363 | 25,027 | 29,363 | 25,027 |  |
Allowance for loan losses: Individually evaluated for impairment | 405 | 85 | 405 | 85 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 863 | 1,334 | 863 | 1,334 |  |
Allowance for loan losses: Collectively evaluated for impairment | 28,095 | 23,608 | 28,095 | 23,608 |  |
Loans: Individually evaluated for impairment | 1,306 | 1,485 | 1,306 | 1,485 |  |
Loans: Purchased credit impaired loans | 7,637 | 12,045 | 7,637 | 12,045 |  |
Loans: Collectively evaluated for impairment | 2,090,351 | 2,047,475 | 2,090,351 | 2,047,475 |  |
Loans receivable | 2,099,294 | 2,061,005 | 2,099,294 | 2,061,005 | 2,059,931 |
Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (332) | (146) |  |
Allowance for loan losses: Recoveries |  |  | 259 | 484 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (442) | (723) |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  | (2,526) | (3,027) |  |
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) |  |
Allowance for loan losses: Recoveries |  |  |  | 2 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (54) | (436) |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  |  |  |
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 |  |  | (77) | (18) |  |
Allowance for loan losses: Recoveries |  |  | 49 | 98 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (124) | (253) |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  |  |  |
Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (102) | (91) |  |
Allowance for loan losses: Recoveries |  |  | 23 | 33 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 175 | 1,685 |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  | (2,344) | (3,341) |  |
Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (153) | (8) |  |
Allowance for loan losses: Recoveries |  |  | 72 | 112 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (192) | (1,633) |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  | (135) | 316 |  |
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (61,601) | (48,493) |  |
Allowance for loan losses: Recoveries |  |  | 13,922 | 9,860 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 44,424 | 96,927 |  |
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 |  |  | (160) | (191) |  |
Allowance for loan losses: Recoveries |  |  | 655 | 673 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 540 | 4,862 |  |
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 |  |  | (593) | (827) |  |
Allowance for loan losses: Recoveries |  |  | 1,001 | 1,422 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 54 | (216) |  |
Non-Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (2,383) | (908) |  |
Allowance for loan losses: Recoveries |  |  | 316 | 497 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 3,988 | 964 |  |
Non-Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (22,691) | (17,403) |  |
Allowance for loan losses: Recoveries |  |  | 5,176 | 4,272 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 21,144 | 14,514 |  |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 158,135 | 119,286 |  |
Allowance for loan losses: Ending balance | 147,654 | 170,044 | 147,654 | 170,044 |  |
Allowance for loan losses: Individually evaluated for impairment | 21,357 | 20,888 | 21,357 | 20,888 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 1,201 | 1,662 | 1,201 | 1,662 |  |
Allowance for loan losses: Collectively evaluated for impairment | 125,096 | 147,494 | 125,096 | 147,494 |  |
Loans: Individually evaluated for impairment | 277,375 | 241,497 | 277,375 | 241,497 |  |
Loans: Purchased credit impaired loans | 33,207 | 27,951 | 33,207 | 27,951 |  |
Loans: Collectively evaluated for impairment | 9,894,861 | 8,766,305 | 9,894,861 | 8,766,305 |  |
Loans receivable | 10,205,443 | 9,035,753 | 10,205,443 | 9,035,753 | 9,520,738 |
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 |  |  | 147,052 | 109,428 |  |
Allowance for loan losses: Ending balance | 134,095 | 159,261 | 134,095 | 159,261 |  |
Allowance for loan losses: Individually evaluated for impairment | 20,880 | 20,665 | 20,880 | 20,665 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 417 | 574 | 417 | 574 |  |
Allowance for loan losses: Collectively evaluated for impairment | 112,798 | 138,022 | 112,798 | 138,022 |  |
Loans: Individually evaluated for impairment | 271,024 | 235,039 | 271,024 | 235,039 |  |
Loans: Purchased credit impaired loans | 20,186 | 11,534 | 20,186 | 11,534 |  |
Loans: Collectively evaluated for impairment | 7,838,219 | 6,887,355 | 7,838,219 | 6,887,355 |  |
Loans receivable | 8,129,429 | 7,133,928 | 8,129,429 | 7,133,928 | 7,613,917 |
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 |  |  | 11,083 | 9,858 |  |
Allowance for loan losses: Ending balance | 13,559 | 10,783 | 13,559 | 10,783 |  |
Allowance for loan losses: Individually evaluated for impairment | 477 | 223 | 477 | 223 |  |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 784 | 1,088 | 784 | 1,088 |  |
Allowance for loan losses: Collectively evaluated for impairment | 12,298 | 9,472 | 12,298 | 9,472 |  |
Loans: Individually evaluated for impairment | 6,351 | 6,458 | 6,351 | 6,458 |  |
Loans: Purchased credit impaired loans | 13,021 | 16,417 | 13,021 | 16,417 |  |
Loans: Collectively evaluated for impairment | 2,056,642 | 1,878,950 | 2,056,642 | 1,878,950 |  |
Loans receivable | $ 2,076,014 | $ 1,901,825 | 2,076,014 | 1,901,825 | $ 1,906,821 |
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [Member] | Total Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  |  | (28) |  |
Allowance for loan losses: Recoveries |  |  | 115 | 239 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (247) | (86) |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  | (47) | (2) |  |
Total Commercial & Industrial [Member] | 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 |  |  |  |  |  |
Allowance for loan losses: Recoveries |  |  | 5 | 76 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (27) | 54 |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  | (47) | (2) |  |
Total Commercial & Industrial [Member] | 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 |  |  |  | (28) |  |
Allowance for loan losses: Recoveries |  |  | 110 | 163 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (220) | (140) |  |
Allowance for loan losses: Decrease in FDIC loss share receivable |  |  |  |  |  |
Total Commercial & 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 |  |  | (35,774) | (29,164) |  |
Allowance for loan losses: Recoveries |  |  | 6,774 | 2,996 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 18,698 | 76,803 |  |
Total Commercial & 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 |  |  | (35,247) | (27,504) |  |
Allowance for loan losses: Recoveries |  |  | 6,437 | 2,709 |  |
Allowance for loan losses: Net provision for loan losses |  |  | 15,922 | 74,500 |  |
Total Commercial & 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 |  |  | (527) | (1,660) |  |
Allowance for loan losses: Recoveries |  |  | 337 | 287 |  |
Allowance for loan losses: Net provision for loan losses |  |  | $ 2,776 | $ 2,303 |  |

X
- 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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- Definition Change in carrying amount of the indemnification asset relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). The change includes for example, but is not limited to, acquisitions, additional estimated losses, disposals, cash payments, accretion of discount and write-offs, net of recoveries. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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