Acquisitions - Assets Acquired and Liabilities Assumed in Freehold Acquisition (Details) - USD ($) $ in Thousands	Dec. 01, 2021	Dec. 31, 2021	Dec. 31, 2020
Liabilities assumed:
Goodwill		$ 85,324	$ 80,285
Freehold Entities
Assets acquired:
Cash and cash equivalents	$ 20,417
Debt securities available for sale	118,017
Federal Home Loan Bank stock	3,032
Loans receivable	158,912
Accrued interest receivable	867
Office properties and equipment, net	5,934
Bank-owned life insurance	8,661
Deferred tax assets, net	454
Core deposit and other intangibles	42
Other assets	162
Total assets acquired	316,498
Liabilities assumed:
Deposits	210,117
Borrowings	59,908
Advance payments by borrowers for taxes and insurance	495
Accrued expenses and other liabilities	4,822
Total liabilities assumed	275,342
Net assets acquired	41,156
Fair market value of stock issued to Columbia Bank MHC for purchase	47,260
Goodwill	$ 6,104