Loans and Allowance for Loan Losses - Schedule of Loan Deferment Status Change by Loan Type (Details) $ in Thousands	Jun. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Balance	$ 323	$ 330
Payment resumed or paid off, Balance	1,249,837	1,104,108
Home Mortgage Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Balance	$ 119,778	$ 128,683
Payment Deferral
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Number of accounts | loan	225
Payment resumed or paid off, Number of accounts | loan	216
Remaining deferments, Number of accounts | loan	9
Total deferments under the CARES Act, Balance	$ 250,727
Payment resumed or paid off, Balance	235,048
Remaining deferments, Balance	$ 15,679
Payment Deferral | Loans, Excluding Home Mortgage and Consumer Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Number of accounts | loan	156
Payment resumed or paid off, Number of accounts | loan	150
Remaining deferments, Number of accounts | loan	6
Total deferments under the CARES Act, Balance	$ 220,522
Payment resumed or paid off, Balance	206,551
Remaining deferments, Balance	$ 13,971
Payment Deferral | Home Mortgage Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Number of accounts | loan	69
Payment resumed or paid off, Number of accounts | loan	66
Remaining deferments, Number of accounts | loan	3
Total deferments under the CARES Act, Balance	$ 30,205
Payment resumed or paid off, Balance	28,497
Remaining deferments, Balance	$ 1,708