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Loans - Narrative (Details)	3 Months Ended	6 Months Ended		24 Months Ended
	Jun. 30, 2022 USD ($) loan	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($) loan	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 5,528,093,000	$ 5,528,093,000		$ 5,231,331,000
Net deferred loan fees	8,200,000	8,200,000		9,600,000
Accrued interest	15,500,000	15,500,000	$ 17,700,000
Decline in total collective reserves			$ 14,000,000
Decrease of individually evaluated portion of the reserve	11,200,000	11,200,000
Funding commitments	1,000	1,000
Nonaccrual mortgage loans held for sale recorded at fair value	$ 2,500,000	$ 2,500,000		1,800,000
Number of loans that defaulted | loan		0	3
Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross interest income that would have been recorded		$ 438,000	$ 880,000
Interest income		$ 0	$ 0
Number of loans classified as TDRs | loan	3	5	0
Outstanding principal balance			$ 743,000
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 901,000	$ 901,000		105,800,000
Net deferred loan fees	57,000	57,000		3,000,000
Payments for loan originations				767,400,000
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	3,550,233,000	$ 3,550,233,000		3,133,334,000
Real estate | Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans classified as TDRs | loan		3
Real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,909,054,000	$ 1,909,054,000		1,693,512,000
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,430,239,000	$ 1,430,239,000		$ 1,454,235,000
Commercial Portfolio Segment | Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans classified as TDRs | loan		2

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