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Fair Value Measurements - Schedule of Recorded Amount of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale $ 1,433,006 $ 1,506,388
U. S. agency securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 653,277 671,397
Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 670,045 727,353
Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 50,216 49,564
Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 8,267 8,490
Corporate bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 1,798 1,683
Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value on a recurring basis 1,464,991 1,537,053
Total liabilities measured at fair value on a recurring basis 30,588 30,555
Recurring | Interest rate product    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 31,984 30,662
Derivative liability 30,588 30,555
Recurring | U.S treasury bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 49,403 47,901
Recurring | U. S. agency securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 653,277 671,397
Recurring | Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 670,045 727,353
Recurring | Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 50,216 49,564
Recurring | Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 8,267 8,490
Recurring | Corporate bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 1,798 1,683
Recurring | Credit risk participation agreements | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 1 3
​Quoted Prices (Level 1) | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value on a recurring basis 0 0
Total liabilities measured at fair value on a recurring basis 0 0
​Quoted Prices (Level 1) | Recurring | Interest rate product    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
​Quoted Prices (Level 1) | Recurring | U.S treasury bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
​Quoted Prices (Level 1) | Recurring | U. S. agency securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
​Quoted Prices (Level 1) | Recurring | Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
​Quoted Prices (Level 1) | Recurring | Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
​Quoted Prices (Level 1) | Recurring | Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
​Quoted Prices (Level 1) | Recurring | Corporate bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
​Quoted Prices (Level 1) | Recurring | Credit risk participation agreements | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Significant Other Observable Inputs (Level 2) | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value on a recurring basis 1,464,991 1,537,053
Total liabilities measured at fair value on a recurring basis 30,588 30,555
Significant Other Observable Inputs (Level 2) | Recurring | Interest rate product    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 31,984 30,662
Derivative liability 30,588 30,555
Significant Other Observable Inputs (Level 2) | Recurring | U.S treasury bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 49,403 47,901
Significant Other Observable Inputs (Level 2) | Recurring | U. S. agency securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 653,277 671,397
Significant Other Observable Inputs (Level 2) | Recurring | Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 670,045 727,353
Significant Other Observable Inputs (Level 2) | Recurring | Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 50,216 49,564
Significant Other Observable Inputs (Level 2) | Recurring | Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 8,267 8,490
Significant Other Observable Inputs (Level 2) | Recurring | Corporate bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 1,798 1,683
Significant Other Observable Inputs (Level 2) | Recurring | Credit risk participation agreements | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 1 3
Significant Other Unobservable Inputs (Level 3) | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value on a recurring basis 0 0
Total liabilities measured at fair value on a recurring basis 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | Interest rate product    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | U.S treasury bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | U. S. agency securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | Corporate bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available-for-sale 0 0
Significant Other Unobservable Inputs (Level 3) | Recurring | Credit risk participation agreements | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset $ 0 $ 0