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Borrowed Funds - Components of Borrowed Funds (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt	$ 471,331	$ 385,292
Total borrowed funds	471,331	385,292
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Long-term debt	218,929	76,782
Subordinated notes 3.70%, net of issuance costs [Member]
Debt Instrument [Line Items]
Long-term debt		199,681
Subordinated notes 6.25%, net of issuance costs [Member]
Debt Instrument [Line Items]
Long-term debt	109,148	$ 108,829
Subordinated notes 2.75% [Member]
Debt Instrument [Line Items]
Long-term debt	$ 143,254

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