The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Allowance for Loan Losses and Reserve for Unfunded Loan Commitments - Allowance for Credit Losses on Financing Receivables on Basis of Impairment Method (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 15,965	$ 15,684	$ 15,488	$ 14,634	$ 14,196	$ 13,556
Total loans	1,335,639		1,293,395
SBA loans held for investment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	56		540
Collectively evaluated for impairment	1,265		1,115
Total	1,321	1,678	1,655	1,637	1,504	1,471
Individually evaluated for impairment	369		1,471
Collectively evaluated for impairment	37,239		37,862
Total loans	37,608		39,333
Commercial loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	80		127
Collectively evaluated for impairment	9,064		8,578
Total	9,144	8,793	8,705	8,355	8,139	7,825
Individually evaluated for impairment	782		1,821
Collectively evaluated for impairment	713,093		692,281
Total loans	713,878		694,102
Residential mortgage loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	4,198		3,900
Total	4,198	4,016	3,900	3,493	3,430	3,130
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	449,604		436,056
Total loans	449,604		436,056
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,302		1,228
Total	1,302	$ 1,197	1,228	$ 1,149	$ 1,123	$ 1,130
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	134,549		123,904
Total loans	134,549		123,904
Total
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	136		667
Collectively evaluated for impairment	15,829		14,821
Total	15,965		15,488
Individually evaluated for impairment	1,151		3,292
Collectively evaluated for impairment	1,334,488		1,290,103
Total loans	$ 1,335,639		$ 1,293,395