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Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | $ 185,827 | $ 52,429
Allowance for credit losses - loan commitments, beginning balance | 9,514 | 874
Total beginning allowance for credit losses - loans and loan commitments | 195,341 | 53,303
Provision for loan losses | (25,139) | 28,072
Provision for loan commitments | (2,783) | 1,743
Total provision for credit losses - loans and loan commitments | (27,922) | 29,815
Charge-offs | (2,460) | (6,126)
Recoveries | 1,812 | 1,410
Net charge-offs | (648) | (4,716)
Allowance for credit losses - loans, ending balance | 160,040 | 114,272
Allowance for credit losses - loan commitments, ending balance | 6,731 | 5,572
Total ending allowance for credit losses - loans and loan commitments | 166,771 | 119,844
ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 41,442
Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 37,850 | 14,116
Allowance for credit losses - loan commitments, beginning balance | 1,275 | 311
Total beginning allowance for credit losses - loans and loan commitments | 39,125 | 14,427
Provision for loan losses | (4,256) | 5,632
Provision for loan commitments | 308 | (582)
Total provision for credit losses - loans and loan commitments | (3,948) | 5,050
Charge-offs | (750) | (2,714)
Recoveries | 440 | 107
Net charge-offs | (310) | (2,607)
Allowance for credit losses - loans, ending balance | 33,284 | 39,227
Allowance for credit losses - loan commitments, ending balance | 1,583 |
Total ending allowance for credit losses - loans and loan commitments | 34,867 | 39,227
Commercial and Industrial [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 22,357
Deposit Overdrafts [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 639 | 1,387
Total beginning allowance for credit losses - loans and loan commitments | 639 | 1,387
Provision for loan losses | 156 | (351)
Total provision for credit losses - loans and loan commitments | 156 | (351)
Charge-offs | (201) | (328)
Recoveries | 113 | 143
Net charge-offs | (88) | (185)
Allowance for credit losses - loans, ending balance | 707 | 1,064
Total ending allowance for credit losses - loans and loan commitments | 707 | 1,064
Deposit Overdrafts [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 213
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 10,841 | 4,949
Allowance for credit losses - loan commitments, beginning balance | 6,508 | 235
Total beginning allowance for credit losses - loans and loan commitments | 17,349 | 5,184
Provision for loan losses | (3,538) | 2,564
Provision for loan commitments | (2,508) | 2,274
Total provision for credit losses - loans and loan commitments | (6,046) | 4,838
Charge-offs | (18) | (1)
Recoveries | 55 | 8
Net charge-offs | 37 | 7
Allowance for credit losses - loans, ending balance | 7,340 | 6,442
Allowance for credit losses - loan commitments, ending balance | 4,000 | 5,111
Total ending allowance for credit losses - loans and loan commitments | 11,340 | 11,553
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 1,524
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 110,652 | 20,293
Allowance for credit losses - loan commitments, beginning balance | 712 | 22
Total beginning allowance for credit losses - loans and loan commitments | 111,364 | 20,315
Provision for loan losses | (11,420) | 20,585
Provision for loan commitments | (504) |
Total provision for credit losses - loans and loan commitments | (11,924) | 20,585
Charge-offs | (19) | (1,398)
Recoveries | 528 | 293
Net charge-offs | 509 | (1,105)
Allowance for credit losses - loans, ending balance | 99,741 | 52,873
Allowance for credit losses - loan commitments, ending balance | 208 |
Total ending allowance for credit losses - loans and loan commitments | 99,949 | 52,873
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 13,078
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 17,851 | 4,311
Allowance for credit losses - loan commitments, beginning balance | 955 | 15
Total beginning allowance for credit losses - loans and loan commitments | 18,806 | 4,326
Provision for loan losses | (4,177) | 237
Provision for loan commitments | (86) | 49
Total provision for credit losses - loans and loan commitments | (4,263) | 286
Charge-offs | (371) | (386)
Recoveries | 135 | 272
Net charge-offs | (236) | (114)
Allowance for credit losses - loans, ending balance | 13,438 | 9,684
Allowance for credit losses - loan commitments, ending balance | 869 | 444
Total ending allowance for credit losses - loans and loan commitments | 14,307 | 10,128
Residential Real Estate [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 5,630
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 6,507 | 2,951
Allowance for credit losses - loan commitments, beginning balance | 19 | 41
Total beginning allowance for credit losses - loans and loan commitments | 6,526 | 2,992
Provision for loan losses | (1,510) | (1,241)
Provision for loan commitments | 2 |
Total provision for credit losses - loans and loan commitments | (1,508) | (1,241)
Charge-offs | (927) | (856)
Recoveries | 462 | 415
Net charge-offs | (465) | (441)
Allowance for credit losses - loans, ending balance | 4,532 | 3,886
Allowance for credit losses - loan commitments, ending balance | 21 |
Total ending allowance for credit losses - loans and loan commitments | 4,553 | 3,886
Consumer [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | 2,576
Home Equity [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 1,487 | 4,422
Allowance for credit losses - loan commitments, beginning balance | 45 | 250
Total beginning allowance for credit losses - loans and loan commitments | 1,532 | 4,672
Provision for loan losses | (394) | 646
Provision for loan commitments | 5 | 2
Total provision for credit losses - loans and loan commitments | (389) | 648
Charge-offs | (174) | (443)
Recoveries | 79 | 172
Net charge-offs | (95) | (271)
Allowance for credit losses - loans, ending balance | 998 | 1,096
Allowance for credit losses - loan commitments, ending balance | 50 | 17
Total ending allowance for credit losses - loans and loan commitments | $ 1,048 | 1,113
Home Equity [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for loan losses |  | $ (3,936)

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