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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Segment and Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | $ 194,514 | $ 217,308 |
Allowance for loan losses: Net provision for loan losses | 47,708 | 36,116 | $ 58,968
Allowance for loan losses: Ending balance | 191,251 | 194,514 | 217,308
Reserve for unfunded lending commitments: Provision for losses | 3,974 |  |
Reserve for unfunded lending commitments: Ending balance | 3,974 |  |
Total allowance for credit losses | 195,225 |  |
Allowance for loan losses: Individually evaluated for impairment | 22,385 | 5,114 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 8,257 | 10,734 |
Allowance for loan losses: Collectively evaluated for impairment | 160,609 | 178,666 |
Reserve for unfunded lending commitments: Individually evaluated for impairment | 3,974 |  |
Loans: Individually evaluated for impairment | 245,651 | 268,755 |
Loans: Purchased credit impaired loans | 215,245 | 129,596 |
Loans: Collectively evaluated for impairment | 20,751,859 | 19,628,060 |
Loans receivable | 21,212,755 | 20,026,411 |
Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (59,077) | (74,622) |
Allowance for loan losses: Recoveries | 12,080 | 22,360 |
Allowance for loan losses: Net provision for loan losses | 43,734 | 36,116 |
Allowance for loan losses: Others |  | (6,648) |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 17,638 | 13,709 |
Allowance for loan losses: Ending balance | 20,869 | 17,638 | 13,709
Total allowance for credit losses | 20,869 |  |
Allowance for loan losses: Individually evaluated for impairment | 18 | 210 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 39 | 43 |
Allowance for loan losses: Collectively evaluated for impairment | 20,812 | 17,385 |
Loans: Individually evaluated for impairment | 1,898 | 2,701 |
Loans: Purchased credit impaired loans | 35,353 | 3,757 |
Loans: Collectively evaluated for impairment | 2,957,197 | 2,335,321 |
Loans receivable | 2,994,448 | 2,341,779 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (32) | (1,633) |
Allowance for loan losses: Recoveries | 569 | 221 |
Allowance for loan losses: Net provision for loan losses | 2,694 | 5,341 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 15,647 | 7,372 |
Allowance for loan losses: Ending balance | 9,350 | 15,647 | 7,372
Total allowance for credit losses | 9,350 |  |
Allowance for loan losses: Individually evaluated for impairment | 21 | 1 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 136 | 83 |
Allowance for loan losses: Collectively evaluated for impairment | 9,193 | 15,563 |
Loans: Individually evaluated for impairment | 277 | 121 |
Loans: Purchased credit impaired loans | 20,516 | 3,387 |
Loans: Collectively evaluated for impairment | 1,136,658 | 1,544,827 |
Loans receivable | 1,157,451 | 1,548,335 |
Total Commercial [Member] | Construction and Land Development [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (7) | (334) |
Allowance for loan losses: Recoveries | 140 | 96 |
Allowance for loan losses: Net provision for loan losses | (6,430) | 8,513 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 111,509 | 140,880 |
Allowance for loan losses: Ending balance | 117,409 | 111,509 | 140,880
Reserve for unfunded lending commitments: Provision for losses | 3,974 |  |
Reserve for unfunded lending commitments: Ending balance | 3,974 |  |
Total allowance for credit losses | 121,383 |  |
Allowance for loan losses: Individually evaluated for impairment | 21,837 | 4,243 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 333 | 454 |
Allowance for loan losses: Collectively evaluated for impairment | 95,239 | 106,812 |
Reserve for unfunded lending commitments: Individually evaluated for impairment | 3,974 |  |
Loans: Individually evaluated for impairment | 236,819 | 261,050 |
Loans: Purchased credit impaired loans | 67,273 | 12,841 |
Loans: Collectively evaluated for impairment | 11,601,315 | 10,804,458 |
Loans receivable | 11,905,407 | 11,078,349 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (39,737) | (48,128) |
Allowance for loan losses: Recoveries | 7,246 | 14,702 |
Allowance for loan losses: Net provision for loan losses | 38,391 | 4,055 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 97,752 | 127,918 |
Allowance for loan losses: Ending balance | 106,432 | 97,752 | 127,918
Reserve for unfunded lending commitments: Provision for losses | 3,974 |  |
Reserve for unfunded lending commitments: Ending balance | 3,974 |  |
Total allowance for credit losses | 110,406 |  |
Allowance for loan losses: Individually evaluated for impairment | 21,733 | 3,636 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 164 | 239 |
Allowance for loan losses: Collectively evaluated for impairment | 84,535 | 93,877 |
Reserve for unfunded lending commitments: Individually evaluated for impairment | 3,974 |  |
Loans: Individually evaluated for impairment | 232,438 | 239,384 |
Loans: Purchased credit impaired loans | 31,073 | 6,629 |
Loans: Collectively evaluated for impairment | 8,903,436 | 8,374,588 |
Loans receivable | 9,166,947 | 8,620,601 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (39,600) | (40,069) |
Allowance for loan losses: Recoveries | 6,940 | 14,385 |
Allowance for loan losses: Net provision for loan losses | 41,340 | (4,482) |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 13,757 | 12,962 |
Allowance for loan losses: Ending balance | 10,977 | 13,757 | 12,962
Total allowance for credit losses | 10,977 |  |
Allowance for loan losses: Individually evaluated for impairment | 104 | 607 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 169 | 215 |
Allowance for loan losses: Collectively evaluated for impairment | 10,704 | 12,935 |
Loans: Individually evaluated for impairment | 4,381 | 21,666 |
Loans: Purchased credit impaired loans | 36,200 | 6,212 |
Loans: Collectively evaluated for impairment | 2,697,879 | 2,429,870 |
Loans receivable | 2,738,460 | 2,457,748 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (137) | (8,059) |
Allowance for loan losses: Recoveries | 306 | 317 |
Allowance for loan losses: Net provision for loan losses | (2,949) | 8,537 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 23,782 | 24,844 |
Allowance for loan losses: Ending balance | 20,331 | 23,782 | 24,844
Total allowance for credit losses | 20,331 |  |
Allowance for loan losses: Individually evaluated for impairment | 217 | 444 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 7,474 | 9,766 |
Allowance for loan losses: Collectively evaluated for impairment | 12,640 | 13,572 |
Loans: Individually evaluated for impairment | 5,174 | 3,876 |
Loans: Purchased credit impaired loans | 86,757 | 105,430 |
Loans: Collectively evaluated for impairment | 2,898,700 | 2,800,775 |
Loans receivable | 2,990,631 | 2,910,081 |
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (846) | (614) |
Allowance for loan losses: Recoveries | 480 | 2,179 |
Allowance for loan losses: Net provision for loan losses | (3,085) | (2,627) |
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 25,938 | 30,503 |
Allowance for loan losses: Ending balance | 23,292 | 25,938 | $ 30,503
Total allowance for credit losses | 23,292 |  |
Allowance for loan losses: Individually evaluated for impairment | 292 | 216 |
Allowance for loan losses: Amounts related to purchased credit impaired loans | 275 | 388 |
Allowance for loan losses: Collectively evaluated for impairment | 22,725 | 25,334 |
Loans: Individually evaluated for impairment | 1,483 | 1,007 |
Loans: Purchased credit impaired loans | 5,346 | 4,181 |
Loans: Collectively evaluated for impairment | 2,157,989 | 2,142,679 |
Loans receivable | 2,164,818 | 2,147,867 |
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (18,455) | (23,913) |
Allowance for loan losses: Recoveries | 3,645 | 5,162 |
Allowance for loan losses: Net provision for loan losses | $ 12,164 | 20,834 |
Allowance for loan losses: Others |  | $ (6,648) |

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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