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Loans, Allowance for Credit Losses and Credit Quality - Textual (Details) - USD ($) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | [1] | Mar. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 140,647,000 | [1] | $ 159,131,000 | $ 152,419,000 | $ 144,319,000 | $ 144,518,000 | $ 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] | 45,702,000 |  |  | 54,881,000 |  |  |
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 |  | 32,692,000 |  |  |  |  |  |
Financing Receivable, Nonaccrual |  | 19,600,000 |  |  |  |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses |  | 15,142,000 | [1] | $ 36,932,000 | 27,559,000 | $ 14,107,000 | $ 14,169,000 | $ 14,402,000
Financing Receivable, Nonaccrual |  | 3,235,000 |  |  | $ 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 |  | $ 12,963,000 |  |  |  |  |  |
[1] | Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $54.0 million and $39.0 million as of June 30, 2023 and June 30, 2022, respectively.
[2] | included $11.5 million of nonaccruing troubled debt restructures ("TDRs").

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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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