Loans and Allowance for Loan Losses - Schedule of Loan Deferment Status Change by Loan Type (Details) $ in Thousands	Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Balance	$ 320	$ 330
Payment resumed or paid off, Balance	1,235,945	1,104,108
Home mortgage loans
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Balance	$ 115,653	$ 128,683
Payment Deferral | Total deferments under the CARES Act
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Number of accounts | loan	225
Payment resumed or paid off, Balance	$ 250,727
Payment Deferral | Remaining deferments
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Balance	$ 6,748
Remaining deferments, Number of accounts | loan	4
Payment Deferral | payment resumed or paid off
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Number of accounts | loan	221
Payment resumed or paid off, Balance	$ 243,979
Payment Deferral | Loans, excluding home mortgage and consumer loans | Total deferments under the CARES Act
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Number of accounts | loan	156
Payment resumed or paid off, Balance	$ 220,522
Payment Deferral | Loans, excluding home mortgage and consumer loans | Remaining deferments
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Balance	$ 6,748
Remaining deferments, Number of accounts | loan	4
Payment Deferral | Loans, excluding home mortgage and consumer loans | payment resumed or paid off
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Number of accounts | loan	152
Payment resumed or paid off, Balance	$ 213,774
Payment Deferral | Home mortgage loans | Total deferments under the CARES Act
Financing Receivable Recorded Investment Past Due [Line Items]
Total deferments under the CARES Act, Number of accounts | loan	69
Payment resumed or paid off, Balance	$ 30,205
Payment Deferral | Home mortgage loans | Remaining deferments
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Balance	$ 0
Remaining deferments, Number of accounts | loan	0
Payment Deferral | Home mortgage loans | payment resumed or paid off
Financing Receivable Recorded Investment Past Due [Line Items]
Payment resumed or paid off, Number of accounts | loan	69
Payment resumed or paid off, Balance	$ 30,205