v3.19.1
Loans Receivable - Activity in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance at beginning of year       $ 10,033       $ 8,597 $ 10,033 $ 8,597
Provision charged to operating expense $ 500 $ 495 $ 630 515 $ 785 $ 700 $ 620 550 2,140 2,655
Recoveries                 231 433
Balance at end of year 11,308       10,033       11,308 10,033
Mortgage Loans Sold                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance at beginning of year       457       442 457 442
Provision charged to operating expense                 106 115
Recoveries                 0 0
Charge-offs                 (62) (100)
Balance at end of year 501       457       501 457
Unfunded Lines of Credit                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance at beginning of year       $ 901       $ 801 901 801
Provision charged to operating expense                 152 100
Recoveries                 0 0
Charge-offs                 0 0
Balance at end of year $ 1,053       $ 901       $ 1,053 $ 901