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Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 140,569,000 | [1] | $ 147,313,000 | [1] | $ 140,647,000 | $ 152,419,000 | $ 144,319,000 | $ 146,922,000
Unfunded commitments |  | $ 1,500,000 |  |  |  |  | 1,300,000 |  |
Days to be termed as non accrual loans |  | 90 days |  |  |  |  |  |  |
Additional commitments to lend to borrowers experiencing financial difficulty party to a loan modification |  | $ 0 |  |  |  |  |  |  |
Additional commitments to lend to borrowers party to a TDR |  |  |  |  |  |  | 64,000 |  |
Financing Receivable, Nonaccrual | [2] | 39,168,000 |  |  |  |  | 54,881,000 |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  |  |  | 68,000 |  |  |  |  |
Finance Receivable, Troubled Debt Restructurings, Post Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  |  |  | 68,000 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Post Modification [Line Items] |  |  |  | 67,000 |  |  |  |  |
Financial Asset, Not Past Due | Aging Loan Modification Member |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 23,801,000 |  |  |  |  |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | 16,934,000 | [1] | 20,169,000 | [1] | 15,142,000 | 27,559,000 | 14,107,000 | 14,402,000
Financing Receivable, Nonaccrual |  | 2,953,000 |  |  |  |  | 26,693,000 |  |
Commercial And Industrial [Member] | Financial Asset, Not Past Due | Aging Loan Modification Member |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 7,409,000 |  |  |  |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | 74,402,000 | [1] | $ 80,036,000 | [1] | $ 78,396,000 | 77,799,000 | $ 83,456,000 | $ 83,486,000
Financing Receivable, Nonaccrual |  | 23,867,000 |  |  |  |  | $ 15,730,000 |  |
Commercial Real Estate [Member] | Terms extension and other than insignificant payment delays |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
TDRs modified during the prior twelve months subsequently defaulted |  | 6,700,000 |  |  |  |  |  |  |
Commercial Real Estate [Member] | Financial Asset, Not Past Due | Aging Loan Modification Member |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 16,252,000 |  |  |  |  |  |  |
[1] | Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $58.1 million and $42.7 million as of September 30, 2023 and September 30, 2022, respectively.
[2] | included $11.5 million of nonaccruing troubled debt restructures ("TDRs"). (2)Nonaccrual balances reported above without an allowance for credit losses are attributable to loans evaluated on an individual basis where it was determined that there was no risk of loss due to sufficient underlying collateral values.

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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://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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