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Mortgage Servicing Rights - Fair Value of Mortgage Servicing Rights (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) yr | Dec. 31, 2021 USD ($) yr | Dec. 31, 2020 USD ($) yr
Servicing Assets at Fair Value [Line Items] |  |  |
Contractually specified servicing fees, late fees and ancillary fees earned | $ 1,887 | $ 1,881 | $ 1,855
Mortgage servicing rights |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Balance at beginning of period | 5,874 | 5,092 | 6,200
Additions | 537 | 1,654 | 1,526
Change in fair value | 301 | (872) | (2,634)
Balance at end of period | $ 6,712 | $ 5,874 | $ 5,092
Constant prepayment rate |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Fair value of mortgage servicing rights, weighted average | 1.270 | 2.080 | 2.940
Expected life (years) |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Fair value of mortgage servicing rights, weighted average | yr | 7.6 | 5.7 | 4.5
Discount rate |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Fair value of mortgage servicing rights, weighted average | 0.120 | 0.120 | 0.120
Loans |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Balance at beginning of period | $ 770,299 | $ 779,530 | $ 767,662
Balance at end of period | $ 739,919 | $ 770,299 | $ 779,530

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122596-111746 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 + Details
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- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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