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Allowance for Credit Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses | $ 223,936 | $ 222,450 | $ 225,141 | $ 226,825 | $ 226,583 | $ 223,712
Total loan and leases | 32,621,208 |  | 28,656,355 |  |  |
Loans acquired with deteriorated credit quality | 495,878 |  | 558,716 |  |  |
Commercial | Construction and land development |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses | 7,290 | 6,906 | 33,213 | 32,088 | 31,944 | 35,270
Commercial | Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses |  |  |  | 47,850 | 48,962 | 43,451
Commercial | Other commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses |  |  |  | 2,252 | 2,342 | 2,481
Commercial | Commercial and industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses | 26,772 | 24,633 | 61,610 | 59,179 | 56,901 | 55,620
Commercial | Other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses |  |  |  | 2,215 | 2,183 | 2,221
Consumer | Construction and land development |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses | 1,609 | 1,640 | 2,709 | 2,898 | 2,750 | 2,350
Consumer | Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses |  |  |  | 35,130 | 35,105 | 35,841
Non-PCD Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 12,915 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 204,690 |  |  |
Total allowance for loan and lease losses |  |  | 217,605 |  |  |
Loans and leases individually evaluated for impairment |  |  | 185,599 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 28,137,181 |  |  |
Total loan and leases |  |  | 28,322,780 |  |  |
Non-PCD Loans | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 5,634 |  |  |
Loans and leases individually evaluated for impairment |  |  | 88,893 |  |  |
Non-PCD Loans | Commercial | Construction and land development |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 463 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 32,750 |  |  |
Total allowance for loan and lease losses |  |  | 33,213 |  |  |
Loans and leases individually evaluated for impairment |  |  | 4,655 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 1,008,799 |  |  |
Total loan and leases |  |  | 1,013,454 |  |  |
Non-PCD Loans | Commercial | Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 3,650 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 41,685 |  |  |
Total allowance for loan and lease losses |  |  | 45,335 |  |  |
Loans and leases individually evaluated for impairment |  |  | 70,149 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 12,212,486 |  |  |
Total loan and leases |  |  | 12,282,635 |  |  |
Non-PCD Loans | Commercial | Other commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 39 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 2,172 |  |  |
Total allowance for loan and lease losses |  |  | 2,211 |  |  |
Loans and leases individually evaluated for impairment |  |  | 1,268 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 540,760 |  |  |
Total loan and leases |  |  | 542,028 |  |  |
Non-PCD Loans | Commercial | Commercial and industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 1,379 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 57,995 |  |  |
Total allowance for loan and lease losses |  |  | 59,374 |  |  |
Loans and leases individually evaluated for impairment |  |  | 12,182 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 4,391,610 |  |  |
Total loan and leases |  |  | 4,403,792 |  |  |
Non-PCD Loans | Commercial | Other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 103 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 2,133 |  |  |
Total allowance for loan and lease losses |  |  | 2,236 |  |  |
Loans and leases individually evaluated for impairment |  |  | 639 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 309,454 |  |  |
Total loan and leases |  |  | 310,093 |  |  |
Non-PCD Loans | Consumer | Construction and land development |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 174 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 2,535 |  |  |
Total allowance for loan and lease losses |  |  | 2,709 |  |  |
Loans and leases individually evaluated for impairment |  |  | 3,882 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 353,503 |  |  |
Total loan and leases |  |  | 357,385 |  |  |
Non-PCD Loans | Consumer | Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 3,278 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 14,954 |  |  |
Total allowance for loan and lease losses |  |  | 18,232 |  |  |
Loans and leases individually evaluated for impairment |  |  | 60,442 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 5,233,475 |  |  |
Total loan and leases |  |  | 5,293,917 |  |  |
Non-PCD Loans | Consumer | Revolving mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 2,722 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 16,980 |  |  |
Total allowance for loan and lease losses |  |  | 19,702 |  |  |
Loans and leases individually evaluated for impairment |  |  | 28,869 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 2,310,203 |  |  |
Total loan and leases |  |  | 2,339,072 |  |  |
Non-PCD Loans | Consumer | Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 1,107 |  |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 33,486 |  |  |
Total allowance for loan and lease losses |  |  | 34,593 |  |  |
Loans and leases individually evaluated for impairment |  |  | 3,513 |  |  |
Loans and leases collectively evaluated for impairment |  |  | 1,776,891 |  |  |
Total loan and leases |  |  | 1,780,404 |  |  |
PCD Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total allowance for loan and lease losses | $ 25,127 | $ 26,928 | 7,536 | $ 6,867 | $ 8,343 | $ 9,144
PCD Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Acquired loans which have adverse change in expected cash flows |  |  | $ 139,400 |  |  |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as 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 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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