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Allowance for Loan Losses - Recorded Investment Disaggregated on Basis of Impairment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment $ 4,170 $ 3,355    
Loans Collectively Evaluated for Impairment 27,854 24,732    
PCI Loans 3,018 3,999    
Total Allowance for Loan Losses 35,042 32,086 $ 31,083 $ 29,746
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 36,439 37,459    
Loans Collectively Evaluated for Impairment 3,589,305 2,767,650    
PCI Loans 24,907 40,603    
Total Gross Loans Receivable 3,650,651 2,845,712    
Commercial business        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 3,955 3,169    
Loans Collectively Evaluated for Impairment 17,606 16,034    
PCI Loans 2,150 2,796    
Total Allowance for Loan Losses 23,711 21,999 22,382 22,064
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 34,734 34,826    
Loans Collectively Evaluated for Impairment 2,885,442 2,191,545    
PCI Loans 17,707 27,769    
Total Gross Loans Receivable 2,937,883 2,254,140    
Commercial business | Commercial and industrial        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 2,607 1,326    
Loans Collectively Evaluated for Impairment 7,913 7,558    
PCI Loans 823 1,026    
Total Allowance for Loan Losses 11,343 9,910 10,968 9,972
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 22,642 11,999    
Loans Collectively Evaluated for Impairment 827,531 630,485    
PCI Loans 3,433 2,912    
Total Gross Loans Receivable 853,606 645,396    
Commercial business | Owner-occupied commercial real estate        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 1,142 621    
Loans Collectively Evaluated for Impairment 3,063 2,557    
PCI Loans 693 814    
Total Allowance for Loan Losses 4,898 3,992 3,661 4,370
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 5,816 6,808    
Loans Collectively Evaluated for Impairment 766,783 603,827    
PCI Loans 7,215 11,515    
Total Gross Loans Receivable 779,814 622,150    
Commercial business | Non-owner occupied commercial real estate        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 206 1,222    
Loans Collectively Evaluated for Impairment 6,630 5,919    
PCI Loans 634 956    
Total Allowance for Loan Losses 7,470 8,097 7,753 7,722
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 6,276 16,019    
Loans Collectively Evaluated for Impairment 1,291,128 957,233    
PCI Loans 7,059 13,342    
Total Gross Loans Receivable 1,304,463 986,594    
One-to-four family residential        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 76 93    
Loans Collectively Evaluated for Impairment 1,015 798    
PCI Loans 112 165    
Total Allowance for Loan Losses 1,203 1,056 1,015 1,157
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 279 299    
Loans Collectively Evaluated for Impairment 98,169 81,443    
PCI Loans 3,315 5,255    
Total Gross Loans Receivable 101,763 86,997    
Real estate construction and land development        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 0 39    
Loans Collectively Evaluated for Impairment 1,915 1,699    
PCI Loans 279 314    
Total Allowance for Loan Losses 2,194 2,052 2,156 1,871
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 899 1,892    
Loans Collectively Evaluated for Impairment 214,138 145,468    
PCI Loans 423 2,124    
Total Gross Loans Receivable 215,460 149,484    
Real estate construction and land development | One-to-four family residential        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 0 2    
Loans Collectively Evaluated for Impairment 1,040 635    
PCI Loans 200 225    
Total Allowance for Loan Losses 1,240 862 797 1,058
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 899 1,247    
Loans Collectively Evaluated for Impairment 101,451 50,649    
PCI Loans 380 89    
Total Gross Loans Receivable 102,730 51,985    
Real estate construction and land development | Five or more family residential and commercial properties        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 0 37    
Loans Collectively Evaluated for Impairment 875 1,064    
PCI Loans 79 89    
Total Allowance for Loan Losses 954 1,190 1,359 813
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 0 645    
Loans Collectively Evaluated for Impairment 112,687 94,819    
PCI Loans 43 2,035    
Total Gross Loans Receivable 112,730 97,499    
Consumer        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 139 54    
Loans Collectively Evaluated for Impairment 5,965 5,303    
PCI Loans 477 724    
Total Allowance for Loan Losses 6,581 6,081 5,024 4,309
Loan Receivables, Disaggregated:        
Loans Individually Evaluated for Impairment 527 442    
Loans Collectively Evaluated for Impairment 391,556 349,194    
PCI Loans 3,462 5,455    
Total Gross Loans Receivable 395,545 355,091    
Unallocated        
Allowance for Loan Losses Disaggregated:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 1,353 898    
PCI Loans 0 0    
Total Allowance for Loan Losses $ 1,353 $ 898 $ 506 $ 345