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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments Carried at Amortized Cost (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and due from financial institutions | $ 63,155 | $ 60,406 |
Investments in time deposits | 1,450 | 1,225 |
Other securities | 30,352 | 29,998 |
Financing Receivable, after Allowance for Credit Loss | 3,041,561 | 2,824,568 |
Mortgage servicing rights | 3,854 | 3,018 | $ 2,689
Accrued interest receivable | 13,453 | 12,819 |
Financial Liabilities: |  |  |
Time deposits | 944,954 |  |
Short-term FHLB advances | 339,000 | 338,000 |
Long-term FHLB advances | 1,501 | 2,392 |
Other borrowings | 6,293 | 9,859 |
Carrying Amount [Member] |  |  |
Financial Assets: |  |  |
Cash and due from financial institutions | 63,155 | 60,406 |
Investments in time deposits | 1,450 | 1,225 |
Other securities | 30,352 | 29,998 |
Loans, held for sale | 665 | 1,725 |
Financing Receivable, after Allowance for Credit Loss | 3,041,561 | 2,824,568 |
Mortgage servicing rights | 2,877 | 3,018 |
Accrued interest receivable | 13,453 | 12,819 |
Financial Liabilities: |  |  |
Nonmaturing deposits | 2,266,916 | 2,084,216 |
Time deposits | 944,954 | 900,812 |
Short-term FHLB advances | 339,000 | 338,000 |
Long-term FHLB advances | 1,501 | 2,392 |
Subordinated debentures | 104,089 | 103,943 |
Other borrowings | 6,293 | 9,859 |
Accrued interest payable | 9,518 | 9,525 |
Total Fair Value [Member] |  |  |
Financial Assets: |  |  |
Cash and due from financial institutions | 63,155 | 60,406 |
Investments in time deposits | 1,450 | 1,225 |
Other securities | 30,352 | 29,998 |
Loans, held for sale | 665 | 1,725 |
Financing Receivable, after Allowance for Credit Loss | 2,919,899 | 2,679,988 |
Mortgage servicing rights | 3,854 | 3,018 |
Accrued interest receivable | 13,453 | 12,819 |
Financial Liabilities: |  |  |
Nonmaturing deposits | 2,266,916 | 2,084,216 |
Time deposits | 948,734 | 899,443 |
Short-term FHLB advances | 339,000 | 337,267 |
Long-term FHLB advances | 1,418 | 2,419 |
Subordinated debentures | 101,175 | 101,563 |
Other borrowings | 6,293 | 9,859 |
Accrued interest payable | 9,518 | 9,525 |
(Level 1) [Member] |  |  |
Financial Assets: |  |  |
Cash and due from financial institutions | 63,155 | 60,406 |
Other securities | 30,352 | 29,998 |
Loans, held for sale | 665 | 1,725 |
Accrued interest receivable | 13,453 | 12,819 |
Financial Liabilities: |  |  |
Nonmaturing deposits | 2,266,916 | 2,084,216 |
Short-term FHLB advances | 339,000 | 337,267 |
Accrued interest payable | 9,518 | 9,525 |
(Level 2) [Member] |  |  |
Financial Assets: |  |  |
Investments in time deposits | 1,450 | 1,225 |
(Level 3) [Member] |  |  |
Financial Assets: |  |  |
Financing Receivable, after Allowance for Credit Loss | 2,919,899 | 2,679,988 |
Mortgage servicing rights | 3,854 | 3,018 |
Financial Liabilities: |  |  |
Time deposits | 948,734 | 899,443 |
Long-term FHLB advances | 1,418 | 2,419 |
Subordinated debentures | 101,175 | 101,563 |
Other borrowings | $ 6,293 | $ 9,859 |

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-2 + Details
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