Loans Receivable - Loans by Earlier of Repricing Date or Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 883,757	$ 869,730
Adjustable-rate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due within one year	99,494	84,284
After one but within five years	238,244	263,118
After five but within ten years	53,142	59,922
After ten years	5,054	5,202
Total	395,934	412,526
Fixed-rate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due within one year	37,110	1,698
After one but within five years	67,786	83,407
After five but within ten years	124,683	120,094
After ten years	258,244	252,005
Total	$ 487,823	$ 457,204