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Borrowed Funds - Components of Borrowed Funds (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Long-term debt	$ 477,164	$ 474,229
Total borrowed funds	477,164	474,229
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Long-term debt	221,176	220,034
Subordinated notes 6.25%, net of issuance costs [Member]
Debt Instrument [Line Items]
Long-term debt	109,361	109,255
Subordinated notes 2.75% [Member]
Debt Instrument [Line Items]
Long-term debt	$ 146,627	$ 144,940

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