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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | $ 181,333 | $ 205,773 | $ 196,711 | $ 218,583
Charge-offs | (29,669) | (33,573) | (39,526) | (40,175)
Recoveries | 1,541 | 5,199 | 3,020 | 6,491
Provision | 13,400 | 26,000 | 6,400 | 18,500
Ending balance - ACL | 166,605 | 203,399 | 166,605 | 203,399
Beginning balance - ACL on off-balance sheet | 3,088 | 5,588 | 2,588 | 5,588
Provision |  | (2,000) | 500 | (2,000)
Ending balance - ACL on off-balance sheet | 3,088 | 3,588 | 3,088 | 3,588
Commercial and Industrial Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 118,668 | 119,568 | 123,732 | 122,700
Charge-offs | (28,015) | (2) | (36,217) | (4,719)
Recoveries | 729 | 3,635 | 1,390 | 3,761
Provision | 21,560 | (5,080) | 24,037 | (3,621)
Ending balance - ACL | 112,942 | 118,121 | 112,942 | 118,121
Beginning balance - ACL on off-balance sheet | 2,178 | 3,859 | 1,739 | 3,859
Provision |  | (1,515) | 439 | (1,515)
Ending balance - ACL on off-balance sheet | 2,178 | 2,344 | 2,178 | 2,344
Specialty Lending Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 861 | 4,673 | 1,738 | 5,219
Charge-offs |  | (31,945) |  | (31,945)
Recoveries | 1 | 36 | 1 | 151
Provision | 271 | 33,137 | (606) | 32,476
Ending balance - ACL | 1,133 | 5,901 | 1,133 | 5,901
Beginning balance - ACL on off-balance sheet | 186 | 287 | 160 | 287
Provision |  | (74) | 26 | (74)
Ending balance - ACL on off-balance sheet | 186 | 213 | 186 | 213
Commercial Real Estate Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 47,310 | 60,043 | 56,265 | 61,931
Recoveries | 23 | 838 | 385 | 1,347
Provision | (10,093) | (4,147) | (19,410) | (6,544)
Ending balance - ACL | 37,240 | 56,734 | 37,240 | 56,734
Beginning balance - ACL on off-balance sheet | 418 | 447 | 480 | 447
Provision |  | (121) | (62) | (121)
Ending balance - ACL on off-balance sheet | 418 | 326 | 418 | 326
Consumer Real Estate Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 4,037 | 4,183 | 3,921 | 6,586
Charge-offs | (25) | (10) | (57) | (86)
Recoveries | 82 | 54 | 110 | 113
Provision | 471 | 1,580 | 591 | (806)
Ending balance - ACL | 4,565 | 5,807 | 4,565 | 5,807
Beginning balance - ACL on off-balance sheet | 124 | 145 | 106 | 145
Provision |  | (3) | 18 | (3)
Ending balance - ACL on off-balance sheet | 124 | 142 | 124 | 142
Consumer Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 418 | 603 | 845 | 1,480
Charge-offs | (161) | (139) | (319) | (248)
Recoveries | 31 | 64 | 60 | 87
Provision | 575 | 329 | 277 | (462)
Ending balance - ACL | 863 | 857 | 863 | 857
Beginning balance - ACL on off-balance sheet | 13 | 381 |  | 381
Provision |  | (173) | 13 | (173)
Ending balance - ACL on off-balance sheet | 13 | 208 | 13 | 208
Credit Cards Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 5,819 | 12,144 | 6,075 | 15,786
Charge-offs | (1,468) | (1,477) | (2,933) | (3,169)
Recoveries | 675 | 572 | 1,074 | 1,014
Provision | 553 | 504 | 1,363 | (1,888)
Ending balance - ACL | 5,579 | 11,743 | 5,579 | 11,743
Leases and Other Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,175 | 1,600 | 2,195 | 2,271
Charge-offs |  |  |  | (8)
Recoveries |  |  |  | 18
Provision | (151) | (200) | (171) | (881)
Ending balance - ACL | 2,024 | 1,400 | 2,024 | 1,400
Beginning balance - ACL on off-balance sheet | 62 | 414 | 15 | 414
Provision |  | (150) | 47 | (150)
Ending balance - ACL on off-balance sheet | 62 | 264 | 62 | 264
Total - Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 179,288 | 202,814 | 194,771 | 215,973
Charge-offs | (29,669) | (33,573) | (39,526) | (40,175)
Recoveries | 1,541 | 5,199 | 3,020 | 6,491
Provision | 13,186 | 26,123 | 6,081 | 18,274
Ending balance - ACL | 164,346 | 200,563 | 164,346 | 200,563
Beginning balance - ACL on off-balance sheet | 2,981 | 5,533 | 2,500 | 5,533
Provision |  | (2,036) | 481 | (2,036)
Ending balance - ACL on off-balance sheet | 2,981 | 3,497 | 2,981 | 3,497
HTM [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 2,045 | 2,959 | 1,940 | 2,610
Provision | 214 | (123) | 319 | 226
Ending balance - ACL | 2,259 | 2,836 | 2,259 | 2,836
Beginning balance - ACL on off-balance sheet | 107 | 55 | 88 | 55
Provision |  | 36 | 19 | 36
Ending balance - ACL on off-balance sheet | $ 107 | $ 91 | $ 107 | $ 91

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