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Mortgage Servicing Rights (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) yr	Dec. 31, 2023 USD ($) yr	Dec. 31, 2022 USD ($) yr
Servicing Asset at Fair Value, Amount [Roll Forward]
Contractually specified servicing fees, late fees and ancillary fees earned	$ 1,739	$ 1,808	$ 1,887
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	6,606	6,712	5,874
Additions	500	400	537
Change in fair value	(480)	(506)	301
Balance at end of period	$ 6,626	$ 6,606	$ 6,712
Constant prepayment rate
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value of mortgage servicing rights, weighted average	1.090	1.160	1.270
Expected life (years)
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value of mortgage servicing rights, weighted average | yr	8.0	7.8	7.6
Discount rate
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value of mortgage servicing rights, weighted average	0.120	0.120	0.120
Loans
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 714,801	$ 739,919	$ 770,299
Balance at end of period	$ 702,596	$ 714,801	$ 739,919

X

- Definition

Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-2

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
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-URI https://asc.fasb.org/1943274/2147481229/860-50-50-3

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
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-URI https://asc.fasb.org/1943274/2147481260/860-50-45-1

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+ References

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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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Value of input used to measure servicing asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
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