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Derivatives and Hedging Activities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2022 USD ($) Derivative | Dec. 31, 2021 USD ($) Derivative | Dec. 31, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net gain (loss) on change in fair value | $ 5,838,000 | $ 4,080,000 | $ (8,750,000)
Collateral posted with market value on liability positions with credit risk-related contingent features | 42,700,000 |  |
Forward TBA Contracts [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net gain (loss) on change in fair value | $ 3,211,000 | $ 2,796,000 | (7,442,000)
Interest Rate Swaps and Caps [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of interest rate swaps | Derivative | 159 | 135 |
Aggregate notional amount | $ 936,800,000 | $ 730,600,000 |
Income (loss) on derivative instrument not designated hedges | $ 4,400,000 | $ 4,500,000 | $ 8,100,000
Risk Participation in Agreements [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of interest rate swaps | Derivative | 16 | 13 |
Aggregate notional amount | $ 187,800,000 | $ 128,200,000 |
Risk Participation out Agreement [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of interest rate swaps | Derivative | 1 | 1 |
Aggregate notional amount | $ 9,600,000 | $ 9,800,000 |
Other Contract [Member] | Forward TBA Contracts [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Aggregate notional amount | $ 14,500,000 | $ 48,500,000 |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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