v3.26.1
Industry Segment Information (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Interest Income (Expense), after Provision for Loan Loss [Abstract]        
Fee revenue and other income $ 27,946,000 $ 28,038,000    
Gain (Loss) on Sale of Investments 5,000 (18,000)    
Interest income 25,104,000 23,390,000    
Interest Expense, Operating 3,888,000 4,116,000    
Interest expense 3,888,000 4,116,000    
Intersegment expense (income) 21,216,000 19,274,000    
Tax-equivalized pre-tax income 10,883,000 10,877,000    
Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest 124,000      
Goodwill 16,164,000 16,164,000   $ 16,164,000
Other intangible assets, net 3,435,000 4,622,000    
Total assets 2,533,791,000 2,318,457,000   $ 2,606,024,000
Average funding sources 2,226,704,000 2,105,410,000    
Provision for credit losses 61,000 905,000    
Total net revenue 49,101,000 46,407,000    
Total personnel expenses 27,279,000 27,279,000    
Occupancy 681,000 721,000    
Equipment 2,432,000 2,294,000    
Bad debt expense 0 (2,000,000)    
Other Cost and Expense, Operating 7,826,000 7,236,000    
Operating Expenses 38,218,000 35,530,000    
Available-for-sale securities, gross realized gains 62,000 0    
Available-for-sale securities, gross realized losses 57,000 18,000    
Share-based compensation expense $ 1,439,000 1,241,000    
Number of Reportable Segments 2      
Supplemental Employee Retirement Plan        
Interest Income (Expense), after Provision for Loan Loss [Abstract]        
Net periodic cost (benefit) $ 108,000 113,000 $ 450,000  
Corporate, Eliminations and Other        
Interest Income (Expense), after Provision for Loan Loss [Abstract]        
Fee revenue and other income 477,000 442,000    
Gain (Loss) on Sale of Investments 5,000 (18,000)    
Interest income (3,641,000) (3,379,000)    
Interest Expense, Operating (2,479,000) (3,861,000)    
Interest expense (2,479,000) (3,861,000)    
Intersegment expense (income) 0 0    
Tax-equivalized pre-tax income (680,000) 906,000    
Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest 0 0    
Goodwill 0 0    
Other intangible assets, net 0 0    
Total assets (250,599,000) (344,704,000)    
Average funding sources 0 0    
Provision for credit losses 0 0    
Total net revenue (680,000) 906,000    
Total personnel expenses 0 0    
Occupancy 0 0    
Equipment 0 0    
Bad debt expense 0 0    
Other Cost and Expense, Operating 0 0    
Operating Expenses 0 0    
Information services payment and processing revenue | Operating Segments        
Interest Income (Expense), after Provision for Loan Loss [Abstract]        
Fee revenue and other income 26,740,000 27,006,000    
Loss on Sale of Investments 0 0    
Interest income 12,731,000 10,565,000    
Interest Expense, Operating 234,000 267,000    
Interest expense 234,000 267,000    
Intersegment expense (income) 870,000 873,000    
Tax-equivalized pre-tax income 5,828,000 6,490,000    
Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest 124,000 528,000    
Goodwill 16,028,000 16,028,000    
Other intangible assets, net 3,435,000 4,622,000    
Total assets 1,598,896,000 1,449,282,000    
Average funding sources 1,429,208,000 1,338,134,000    
Provision for credit losses 0 0    
Total net revenue 39,237,000 37,304,000    
Total personnel expenses 24,099,000 24,121,000    
Occupancy 519,000 527,000    
Equipment 2,155,000 2,227,000    
Bad debt expense 0 (2,000,000)    
Other Cost and Expense, Operating 5,766,000 5,066,000    
Operating Expenses 33,409,000 30,814,000    
Banking Services | Operating Segments        
Interest Income (Expense), after Provision for Loan Loss [Abstract]        
Fee revenue and other income 724,000 608,000    
Loss on Sale of Investments 0 0    
Interest income 16,014,000 16,204,000    
Interest Expense, Operating 6,133,000 7,710,000    
Interest expense 6,133,000 7,710,000    
Intersegment expense (income) (870,000) (873,000)    
Tax-equivalized pre-tax income 5,735,000 3,481,000    
Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest 0 0    
Goodwill 136,000 136,000    
Other intangible assets, net 0 0    
Total assets 1,185,494,000 1,213,879,000    
Average funding sources 797,496,000 767,276,000    
Provision for credit losses 61,000 905,000    
Total net revenue 10,544,000 8,197,000    
Total personnel expenses 3,180,000 3,158,000    
Occupancy 162,000 194,000    
Equipment 277,000 67,000    
Bad debt expense 0 0    
Other Cost and Expense, Operating 2,060,000 2,170,000    
Operating Expenses $ 4,809,000 $ 4,716,000