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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       $ 21,296       $ 17,317 $ 21,296 $ 17,317 $ 12,200
Charge-offs                 (1,362) (5,242) (1,380)
Recoveries                 362 445 72
Provisions for (reduction in) loan losses $ 2,185 $ 2,049 $ 1,904 2,502 $ 2,054 $ 4,013 $ 1,589 1,120 8,640 8,776 6,425
Balance, at the end of the period 28,936       21,296       28,936 21,296 17,317
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 55       250       55 250 731
General portfolio allocation 28,881       21,046       28,881 21,046 16,586
Loans individually evaluated for impairment 3,284       1,141       $ 3,284 $ 1,141 $ 2,784
Specific reserves to total loans individually evaluated for impairment                 1.67% 21.91% 26.26%
Loans collectively evaluated for impairment 6,195,343       3,236,842       $ 6,195,343 $ 3,236,842 $ 2,259,899
General reserves to total loans collectively evaluated for impairment                 0.47% 0.65% 0.73%
Total gross loans 6,198,627       3,237,983       $ 6,198,627 $ 3,237,983 $ 2,254,118
Total allowance to gross loans                 0.47% 0.66% 0.77%
Owner Occupied Commercial Real Estate Loans Commercial and Industrial Loans and Small Business Administration Loans                      
Allowance for Loan Losses                      
Period One Considered for Comparison of Allowance for Loan Losses Factor                 1 year    
Period Two Considered for Comparison of Allowance for Loan Losses Factor                 1 year 4 months 24 days    
Business Loans | Commercial and industrial                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       6,362       3,449 $ 6,362 $ 3,449 $ 2,646
Charge-offs                 (1,344) (2,802) (484)
Recoveries                 94 177 47
Provisions for (reduction in) loan losses                 4,609 5,538 1,240
Balance, at the end of the period 9,721       6,362       9,721 6,362 3,449
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       250       0 250 0
General portfolio allocation 9,721       6,112       9,721 6,112 3,449
Loans individually evaluated for impairment 1,160       250       $ 1,160 $ 250 $ 313
Specific reserves to total loans individually evaluated for impairment                 0.00% 100.00% 0.00%
Loans collectively evaluated for impairment 1,085,499       562,919       $ 1,085,499 $ 562,919 $ 309,428
General reserves to total loans collectively evaluated for impairment                 0.90% 1.09% 1.11%
Total gross loans 1,086,659       563,169       $ 1,086,659 $ 563,169 $ 309,741
Total allowance to gross loans                 0.89% 1.13% 1.11%
Business Loans | Franchise                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       3,845       3,124 $ 3,845 $ 3,124 $ 1,554
Charge-offs                 0 (980) (764)
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 1,952 1,701 2,334
Balance, at the end of the period 5,797       3,845       5,797 3,845 3,124
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 731
General portfolio allocation 5,797       3,845       5,797 3,845 2,393
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 1,630
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 44.85%
Loans collectively evaluated for impairment 660,414       459,421       $ 660,414 $ 459,421 $ 327,295
General reserves to total loans collectively evaluated for impairment                 0.88% 0.84% 0.73%
Total gross loans 660,414       459,421       $ 660,414 $ 459,421 $ 328,925
Total allowance to gross loans                 0.88% 0.84% 0.95%
Business Loans | Commercial owner occupied                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       1,193       1,870 $ 1,193 $ 1,870 $ 1,757
Charge-offs                 0 (329) 0
Recoveries                 105 25 0
Provisions for (reduction in) loan losses                 (531) (373) 113
Balance, at the end of the period 767       1,193       767 1,193 1,870
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 55       0       55 0 0
General portfolio allocation 712       1,193       712 1,193 1,870
Loans individually evaluated for impairment 97       436       $ 97 $ 436 $ 536
Specific reserves to total loans individually evaluated for impairment                 56.70% 0.00% 0.00%
Loans collectively evaluated for impairment 1,289,116       454,482       $ 1,289,116 $ 454,482 $ 294,190
General reserves to total loans collectively evaluated for impairment                 0.06% 0.26% 0.64%
Total gross loans 1,289,213       454,918       $ 1,289,213 $ 454,918 $ 294,726
Total allowance to gross loans                 0.06% 0.26% 0.63%
Business Loans | SBA                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       1,039       1,500 $ 1,039 $ 1,500 $ 568
Charge-offs                 (8) (980) 0
Recoveries                 127 193 8
Provisions for (reduction in) loan losses                 1,732 326 924
Balance, at the end of the period 2,890       1,039       2,890 1,039 1,500
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 2,890       1,039       2,890 1,039 1,500
Loans individually evaluated for impairment 1,201       316       $ 1,201 $ 316 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 184,313       88,678       $ 184,313 $ 88,678 $ 62,256
General reserves to total loans collectively evaluated for impairment                 1.57% 1.17% 2.41%
Total gross loans 185,514       88,994       $ 185,514 $ 88,994 $ 53,691
Total allowance to gross loans                 1.56% 1.17% 2.79%
Business Loans | Agribusiness                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       0       0 $ 0 $ 0 $ 0
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 1,291 0 0
Balance, at the end of the period 1,291       0       1,291 0 0
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 1,291       0       1,291 0 0
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 116,066       0       $ 116,066 $ 0 $ 0
General reserves to total loans collectively evaluated for impairment                 1.11% 0.00% 0.00%
Total gross loans 116,066       0       $ 116,066 $ 0 $ 0
Total allowance to gross loans                 1.11% 0.00% 0.00%
Business Loans | Warehouse Facilities                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       0       759 $ 0 $ 759 $ 546
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 0 (759) 213
Balance, at the end of the period 0       0       0 0 759
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 0       0       0 0 759
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 0       0       $ 0 $ 0 $ 143,200
General reserves to total loans collectively evaluated for impairment                 0.00% 0.00% 0.53%
Total gross loans 0       0       $ 0 $ 0 $ 143,200
Total allowance to gross loans                 0.00% 0.00% 0.53%
Real Estate Loans | Commercial non-owner occupied                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       1,715       2,048 $ 1,715 $ 2,048 $ 2,007
Charge-offs                 0 0 (116)
Recoveries                 0 21 3
Provisions for (reduction in) loan losses                 (449) (354) 154
Balance, at the end of the period 1,266       1,715       1,266 1,715 2,048
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 1,266       1,715       1,266 1,715 2,048
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 214
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 1,243,115       586,975       $ 1,243,115 $ 586,975 $ 421,369
General reserves to total loans collectively evaluated for impairment                 0.10% 0.29% 0.49%
Total gross loans 1,243,115       586,975       $ 1,243,115 $ 586,975 $ 421,583
Total allowance to gross loans                 0.10% 0.29% 0.49%
Real Estate Loans | Multi-family                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       2,927       1,583 $ 2,927 $ 1,583 $ 1,060
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 (2,320) 1,344 523
Balance, at the end of the period 607       2,927       607 2,927 1,583
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 607       2,927       607 2,927 1,583
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 794,384       690,955       $ 794,384 $ 690,955 $ 429,003
General reserves to total loans collectively evaluated for impairment                 0.08% 0.42% 0.37%
Total gross loans 794,384       690,955       $ 794,384 $ 690,955 $ 429,003
Total allowance to gross loans                 0.08% 0.42% 0.37%
Real Estate Loans | One-to-four family                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       365       698 $ 365 $ 698 $ 842
Charge-offs                 (10) (151) (16)
Recoveries                 35 25 13
Provisions for (reduction in) loan losses                 413 (207) (141)
Balance, at the end of the period 803       365       803 365 698
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 803       365       803 365 698
Loans individually evaluated for impairment 817       124       $ 817 $ 124 $ 70
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 270,077       100,327       $ 270,077 $ 100,327 $ 79,980
General reserves to total loans collectively evaluated for impairment                 0.30% 0.36% 0.87%
Total gross loans 270,894       100,451       $ 270,894 $ 100,451 $ 80,050
Total allowance to gross loans                 0.30% 0.36% 0.87%
Real Estate Loans | Construction                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       3,632       2,030 $ 3,632 $ 2,030 $ 1,088
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 937 1,602 942
Balance, at the end of the period 4,569       3,632       4,569 3,632 2,030
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 4,569       3,632       4,569 3,632 2,030
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 282,811       269,159       $ 282,811 $ 269,159 $ 169,748
General reserves to total loans collectively evaluated for impairment                 1.62% 1.35% 1.20%
Total gross loans 282,811       269,159       $ 282,811 $ 269,159 $ 169,748
Total allowance to gross loans                 1.62% 1.35% 1.20%
Real Estate Loans | Farmland                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       0       0 $ 0 $ 0 $ 0
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 137 0 0
Balance, at the end of the period 137       0       137 0 0
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 137       0       137 0 0
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 145,393       0       $ 145,393 $ 0 $ 0
General reserves to total loans collectively evaluated for impairment                 0.09% 0.00% 0.00%
Total gross loans 145,393       0       $ 145,393 $ 0 $ 0
Total allowance to gross loans                 0.09% 0.00% 0.00%
Real Estate Loans | Land                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       198       233 $ 198 $ 233 $ 108
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provisions for (reduction in) loan losses                 795 (35) 125
Balance, at the end of the period 993       198       993 198 233
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 993       198       993 198 233
Loans individually evaluated for impairment 9       15       $ 9 $ 15 $ 21
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 31,224       19,814       $ 31,224 $ 19,814 $ 18,319
General reserves to total loans collectively evaluated for impairment                 3.18% 1.00% 1.27%
Total gross loans 31,233       19,829       $ 31,233 $ 19,829 $ 18,340
Total allowance to gross loans                 3.18% 1.00% 1.27%
Consumer Loans | Consumer loans                      
Allocation of allowance as well as the activity in allowance                      
Balance, at the beginning of the period       $ 20       $ 23 $ 20 $ 23 $ 24
Charge-offs                 0 0 0
Recoveries                 1 4 1
Provisions for (reduction in) loan losses                 74 (7) (2)
Balance, at the end of the period 95       20       95 20 23
Amount of allowance attributed to:                      
Specifically evaluated impaired loans 0       0       0 0 0
General portfolio allocation 95       20       95 20 23
Loans individually evaluated for impairment 0       0       $ 0 $ 0 $ 0
Specific reserves to total loans individually evaluated for impairment                 0.00% 0.00% 0.00%
Loans collectively evaluated for impairment 92,931       4,112       $ 92,931 $ 4,112 $ 5,111
General reserves to total loans collectively evaluated for impairment                 0.10% 0.49% 0.45%
Total gross loans $ 92,931       $ 4,112       $ 92,931 $ 4,112 $ 5,111
Total allowance to gross loans                 0.10% 0.49% 0.45%