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Loans Receivable - Average Recorded Investment of Impaired Loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans $ 39,488,000 $ 32,751,000 $ 32,341,000
Nonaccrual      
Financing Receivable, Modifications [Line Items]      
Interest income recognized 0 0 0
Restructured performing      
Financing Receivable, Modifications [Line Items]      
Interest income recognized 1,400,000 1,200,000 651,000
Commercial business      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 37,550,000 28,873,000 26,456,000
Commercial business | Commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 16,773,000 11,310,000 10,207,000
Commercial business | Owner-occupied commercial real estate      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 11,312,000 5,401,000 4,540,000
Commercial business | Non-owner occupied commercial real estate      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 9,465,000 12,162,000 11,709,000
One-to-four family residential      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 290,000 309,000 279,000
Real estate construction and land development      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 1,220,000 3,218,000 4,961,000
Real estate construction and land development | One-to-four family residential      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 1,091,000 2,315,000 3,305,000
Real estate construction and land development | Five or more family residential and commercial properties      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans 129,000 903,000 1,656,000
Consumer      
Financing Receivable, Modifications [Line Items]      
Average recorded investment of impaired loans $ 428,000 $ 351,000 $ 645,000