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Revenue Recognition - Summary of Company's Revenue Streams (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
Dec. 31, 2016
INTEREST INCOME                      
Loans                 $ 415,410 $ 251,027 $ 157,935
Investment securities and other interest-earning assets                 33,013 18,978 8,670
Total interest income $ 136,021 $ 128,876 $ 92,699 $ 90,827 $ 85,684 $ 70,161 $ 68,733 $ 45,427 448,423 270,005 166,605
NONINTEREST INCOME                      
Loan servicing fees                 1,445 787 1,032
Earnings on bank-owned life insurance                 3,427 2,279 1,353
Net gain from sales of loans                 10,759 12,468 9,539
Net gain from sales of investment securities                 1,399 2,737 1,797
Other income                 3,641 5,680 2,639
Total noninterest income $ 6,970 $ 8,240 $ 8,151 $ 7,666 $ 9,451 $ 8,221 $ 8,759 $ 4,683 31,027 31,114 19,602
Service charges on deposit accounts                      
NONINTEREST INCOME                      
Noninterest income                 5,128 3,273 1,459
Other service fee income                      
NONINTEREST INCOME                      
Noninterest income                 902 1,847 1,516
Debit card interchange income                      
NONINTEREST INCOME                      
Noninterest income                 4,326 2,043 267
Within Scope                      
NONINTEREST INCOME                      
Other income                 1,242 491 449
Total noninterest income                 11,598 7,654 3,691
Total revenues                 11,598 7,654 3,691
Within Scope | Service charges on deposit accounts                      
NONINTEREST INCOME                      
Noninterest income                 5,128 3,273 1,459
Within Scope | Other service fee income                      
NONINTEREST INCOME                      
Noninterest income                 902 1,847 1,516
Within Scope | Debit card interchange income                      
NONINTEREST INCOME                      
Noninterest income                 4,326 2,043 267
Out of Scope                      
INTEREST INCOME                      
Loans                 415,410 251,027 157,935
Investment securities and other interest-earning assets                 33,013 18,978 8,670
Total interest income                 448,423 270,005 166,605
NONINTEREST INCOME                      
Loan servicing fees                 1,445 787 1,032
Earnings on bank-owned life insurance                 3,427 2,279 1,353
Net gain from sales of loans                 10,759 12,468 9,539
Net gain from sales of investment securities                 1,399 2,737 1,797
Other income                 2,399 5,189 2,190
Total noninterest income                 19,429 23,460 15,911
Total revenues                 $ 467,852 $ 293,465 $ 182,516