Allowance for Loan Losses - Past due and non-accrual loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing receivable, past due
Current	$ 1,689,737	$ 1,665,554
Total loans	1,689,737	1,665,554
Residential Real Estate | Real Estate Loans
Financing receivable, past due
Current	368,370	342,491
Total loans	368,370	342,491
Commercial Real Estate | Real Estate Loans
Financing receivable, past due
Current	1,083,194	968,442
Total loans	1,083,194	968,442
Construction and land development | Real Estate Loans
Financing receivable, past due
Current	189,644	231,090
Total loans	189,644	231,090
Commercial | Commercial - Non-Real Estate
Financing receivable, past due
Current	47,878	122,945
Total loans	47,878	122,945
Consumer | Consumer - Non-Real Estate
Financing receivable, past due
Current	651	586
Total loans	$ 651	$ 586