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Loans and Allowance for Credit Losses - Rollforward of Allowance for Credit/Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 203,399 | $ 203,605 | $ 218,583 | $ 101,788
Charge-offs | (5,068) | (9,484) | (45,243) | (25,606)
Recoveries | 1,941 | 4,373 | 8,432 | 7,282
Provision | (4,000) | 16,000 | 14,500 | 122,000
Ending balance - ACL | 196,272 | 214,494 | 196,272 | 214,494
Beginning balance - ACL on off-balance sheet | 3,588 | 6,478 | 5,588 | 2,978
Provision | (1,000) |  | (3,000) | 3,500
Ending balance - ACL on off-balance sheet | 2,588 | 6,478 | 2,588 | 6,478
ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 9,030
Commercial and Industrial Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 118,121 | 114,610 | 122,700 | 63,313
Charge-offs | (1,592) | (4,554) | (6,311) | (6,990)
Recoveries | 1,165 | 3,923 | 4,926 | 5,640
Provision | (12,559) | 5,880 | (16,180) | 54,219
Ending balance - ACL | 105,135 | 119,859 | 105,135 | 119,859
Beginning balance - ACL on off-balance sheet | 2,344 | 5,417 | 3,859 | 2,263
Provision | (605) |  | (2,120) | 3,154
Ending balance - ACL on off-balance sheet | 1,739 | 5,417 | 1,739 | 5,417
Commercial and Industrial Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 3,677
Specialty Lending Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 5,901 | 929 | 5,219 | 2,545
Charge-offs |  |  | (31,945) |
Recoveries | 3 |  | 154 |
Provision | 816 | 2,654 | 33,292 | 890
Ending balance - ACL | 6,720 | 3,583 | 6,720 | 3,583
Beginning balance - ACL on off-balance sheet | 213 | 81 | 287 | 53
Provision | (53) |  | (127) | 28
Ending balance - ACL on off-balance sheet | 160 | 81 | 160 | 81
Specialty Lending Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 148
Commercial Real Estate Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 56,734 | 55,834 | 61,931 | 15,951
Charge-offs | (77) | (3,000) | (77) | (11,920)
Recoveries | 213 | 6 | 1,560 | 82
Provision | 10,663 | 6,194 | 4,119 | 53,995
Ending balance - ACL | 67,533 | 59,034 | 67,533 | 59,034
Beginning balance - ACL on off-balance sheet | 326 | 403 | 447 | 257
Provision | 154 |  | 33 | 146
Ending balance - ACL on off-balance sheet | 480 | 403 | 480 | 403
Commercial Real Estate Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 926
Consumer Real Estate Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 5,807 | 5,952 | 6,586 | 2,623
Charge-offs |  |  | (86) | (219)
Recoveries | 16 | 9 | 129 | 57
Provision | 360 | 1,644 | (446) | 4,992
Ending balance - ACL | 6,183 | 7,605 | 6,183 | 7,605
Beginning balance - ACL on off-balance sheet | 142 | 314 | 145 | 102
Provision | (36) |  | (39) | 212
Ending balance - ACL on off-balance sheet | 106 | 314 | 106 | 314
Consumer Real Estate Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 152
Consumer Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 857 | 1,606 | 1,480 | 543
Charge-offs | (1,782) | (107) | (2,030) | (513)
Recoveries | 83 | 56 | 170 | 271
Provision | 1,856 | 857 | 1,394 | 2,080
Ending balance - ACL | 1,014 | 2,412 | 1,014 | 2,412
Beginning balance - ACL on off-balance sheet | 208 | 33 | 381 | 22
Provision | (208) |  | (381) | 11
Ending balance - ACL on off-balance sheet |  | 33 |  | 33
Consumer Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 31
Credit Cards Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 11,743 | 19,585 | 15,786 | 15,739
Charge-offs | (1,617) | (1,823) | (4,786) | (5,953)
Recoveries | 461 | 379 | 1,475 | 1,232
Provision | (4,265) | (824) | (6,153) | 5,385
Ending balance - ACL | 6,322 | 17,317 | 6,322 | 17,317
Credit Cards Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 914
Leases and Other Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 1,400 | 1,784 | 2,271 | 1,074
Charge-offs |  |  | (8) | (11)
Recoveries |  |  | 18 |
Provision | (151) | 94 | (1,032) | 753
Ending balance - ACL | 1,249 | 1,878 | 1,249 | 1,878
Beginning balance - ACL on off-balance sheet | 264 | 173 | 414 | 211
Provision | (249) |  | (399) | (38)
Ending balance - ACL on off-balance sheet | 15 | 173 | 15 | 173
Leases and Other Portfolio [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 62
Total - Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 200,563 | 200,300 | 215,973 | 101,788
Charge-offs | (5,068) | (9,484) | (45,243) | (25,606)
Recoveries | 1,941 | 4,373 | 8,432 | 7,282
Provision | (3,280) | 16,499 | 14,994 | 122,314
Ending balance - ACL | 194,156 | 211,688 | 194,156 | 211,688
Beginning balance - ACL on off-balance sheet | 3,497 | 6,421 | 5,533 | 2,908
Provision | (997) |  | (3,033) | 3,513
Ending balance - ACL on off-balance sheet | 2,500 | 6,421 | 2,500 | 6,421
Total - Loans [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | 5,910
HTM [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,836 | 3,305 | 2,610 |
Provision | (720) | (499) | (494) | (314)
Ending balance - ACL | 2,116 | 2,806 | 2,116 | 2,806
Beginning balance - ACL on off-balance sheet | 91 | 57 | 55 | 70
Provision | (3) |  | 33 | (13)
Ending balance - ACL on off-balance sheet | $ 88 | $ 57 | $ 88 | 57
HTM [Member] | ASU 2016-13 Adjustment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
ASU 2016-13 adjustment |  |  |  | $ 3,120

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