Revenue Recognition Summary of Company's Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Loans	$ 85,625	$ 84,173	$ 63,554	$ 169,798	$ 105,990
Investment securities and other interest-earning assets	7,074	6,654	5,179	13,728	8,170
Total interest income	92,699	90,827	68,733	183,526	114,160
Noninterest income:
Loan servicing fees	292	345	143	637	365
Earnings on bank-owned life insurance	617	611	689	1,228	1,025
Net gain from sales of loans	3,843	2,958	2,887	6,801	5,698
Net gain from sales of investment securities	330	6	2,093	336	2,093
Other income	753	1,414	907	2,167	1,434
Total noninterest income	8,151	7,666	8,759	15,817	13,442
Service charges on deposit accounts
Noninterest income:
Noninterest income	1,057	1,150	866	2,207	1,207
Other service fee income
Noninterest income:
Noninterest income	169	146	495	315	874
Debit card interchange fee income
Noninterest income:
Noninterest income	1,090	1,036	679	2,126	746
Within Scope
Noninterest income:
Other income	297	237	90	530	139
Total noninterest income	2,613	2,569	2,130	5,178	2,966
Total revenues	2,613	2,569	2,130	5,178	2,966
Within Scope | Service charges on deposit accounts
Noninterest income:
Noninterest income	1,057	1,150	866	2,207	1,207
Within Scope | Other service fee income
Noninterest income:
Noninterest income	169	146	495	315	874
Within Scope | Debit card interchange fee income
Noninterest income:
Noninterest income	1,090	1,036	679	2,126	746
Out of Scope
Interest income:
Loans	85,625	84,173	63,554	169,798	105,990
Investment securities and other interest-earning assets	7,074	6,654	5,179	13,728	8,170
Total interest income	92,699	90,827	68,733	183,526	114,160
Noninterest income:
Loan servicing fees	292	345	143	637	365
Earnings on bank-owned life insurance	617	611	689	1,228	1,025
Net gain from sales of loans	3,843	2,958	2,887	6,801	5,698
Net gain from sales of investment securities	330	6	2,093	336	2,093
Other income	456	1,177	817	1,637	1,295
Total noninterest income	5,538	5,097	6,629	10,639	10,476
Total revenues	$ 98,237	$ 95,924	$ 75,362	$ 194,165	$ 124,636