v3.26.3
Fair Value Measurements - Schedule of Additional Information about Financial Assets and Liabilities Measured at Fair Value Utilized Level 3 (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Loans Held For Sale [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of period $ 31,277 $ 44,360
Originations 263,725 370,856
Sales proceeds (284,050) (393,506)
Transfers other 0 0
Total gains during the period recognized in earnings 6,760 9,567
Balance, end of period 17,712 31,277
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date (765) 48
Derivative Financial Assets Tba Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of period 0 278
Originations 0 0
Sales proceeds 0 0
Transfers other 588 (278)
Total gains during the period recognized in earnings 0 0
Balance, end of period 588 0
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 588 0
Derivative Financial Assets Forward Sales Commitments [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of period 15 0
Originations 0 0
Sales proceeds 0 0
Transfers other (2) 15
Total gains during the period recognized in earnings 0 0
Balance, end of period 13 15
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 13 15
Interest Rate Lock Commitments [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of period 458 339
Originations 0 0
Sales proceeds 0 0
Transfers other (428) 119
Total gains during the period recognized in earnings 0 0
Balance, end of period 30 458
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 30 458
Derivative Financial Liabilities Tba Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of period 70 0
Originations 0 0
Sales proceeds 0 0
Transfers other (70) 70
Total gains during the period recognized in earnings 0 0
Balance, end of period 0 70
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date 0 70
Derivative Financial Liabilities Forward Sales Commitments [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of period $ 0 20
Originations   0
Sales proceeds   0
Transfers other   (20)
Total gains during the period recognized in earnings   0
Balance, end of period   0
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date   $ 0