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Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | $ 131,388 | $ 54,619
Charge-offs | (1,570) | (8,445)
Recoveries | 1,575 | 1,909
Provision for Credit Losses | (17,356) | 16,950
Balance at End of Period | 114,037 | 106,380
Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | 41,347
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 131,388 | 95,966
Commercial |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 30,567 | 21,359
Charge-offs | (407) | (5,042)
Recoveries | 238 | 357
Provision for Credit Losses | (5,268) | 7,301
Balance at End of Period | 25,130 | 31,125
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | 7,150
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 30,567 | 28,509
Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 75,810 | 20,535
Charge-offs | (1) | (1,292)
Recoveries | 73 | 669
Provision for Credit Losses | (5,321) | 8,643
Balance at End of Period | 70,561 | 54,103
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | 25,548
Commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 75,810 | 46,083
BBCC |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 6,120 | 2,279
Charge-offs | (36) | (15)
Recoveries | 41 | 66
Provision for Credit Losses | (3,588) | (615)
Balance at End of Period | 2,537 | 5,417
BBCC | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | 3,702
BBCC | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 6,120 | 5,981
Residential real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 12,608 | 2,299
Charge-offs | (158) | (300)
Recoveries | 87 | 169
Provision for Credit Losses | (2,272) | 483
Balance at End of Period | 10,265 | 9,637
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | 6,986
Residential real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 12,608 | 9,285
Indirect |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 3,580 | 5,319
Charge-offs | (584) | (1,203)
Recoveries | 537 | 414
Provision for Credit Losses | (1,278) | 805
Balance at End of Period | 2,255 | 3,666
Indirect | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | (1,669)
Indirect | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 3,580 | 3,650
Direct |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 855 | 1,863
Charge-offs | (302) | (475)
Recoveries | 260 | 152
Provision for Credit Losses | (148) | 341
Balance at End of Period | 665 | 822
Direct | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | (1,059)
Direct | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 855 | 804
Home equity |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 1,848 | 965
Charge-offs | (82) | (118)
Recoveries | 339 | 82
Provision for Credit Losses | 519 | (8)
Balance at End of Period | 2,624 | 1,610
Home equity | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | 689
Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | $ 1,848 | $ 1,654

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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=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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=121599878&loc=SL82895884-210446 Reference 4: 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=121599337&loc=SL82919249-210447 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=121599337&loc=SL82919249-210447 + Details
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