Allowance for Loan Losses - Past due and non-accrual loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing receivable, past due
Current	$ 1,721,931	$ 1,665,554
Total loans	1,721,931	1,665,554
Residential Real Estate | Real Estate Loans
Financing receivable, past due
Current	385,696	342,491
Total loans	385,696	342,491
Commercial Real Estate | Real Estate Loans
Financing receivable, past due
Current	1,091,221	968,442
Total loans	1,091,221	968,442
Construction and land development | Real Estate Loans
Financing receivable, past due
Current	199,324	231,090
Total loans	199,324	231,090
Commercial | Commercial - Non-Real Estate
Financing receivable, past due
Current	45,105	122,945
Total loans	45,105	122,945
Consumer | Consumer - Non-Real Estate
Financing receivable, past due
Current	585	586
Total loans	$ 585	$ 586