Commitments, Contingencies and Concentrations of Credit Risk - Summary of Commitments and Contingent Liabilities (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Fixed-rate	$ 350,114
Adjustable-rate	1,770
Floating-rate	319,134
Unused consumer and residential construction loan lines of credit (primarily floating-rate)
Debt Instrument [Line Items]
Unused loan lines of credit (primarily floating-rate)	358,586
Unused commercial and commercial construction loan lines of credit (primarily floating-rate)
Debt Instrument [Line Items]
Unused loan lines of credit (primarily floating-rate)	$ 1,011,233

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant