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	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 14,988	$ 14,634	$ 13,556	$ 13,113	$ 12,800	$ 12,579
Total loans	1,270,275		1,147,864
SBA loans held for investment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	325		194
Collectively evaluated for impairment	1,210		1,277
Total	1,535	1,637	1,471	1,624	1,514	1,576
Individually evaluated for impairment	1,193		605
Collectively evaluated for impairment	39,858		43,394
Total loans	41,051		43,999
Commercial loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	122		138
Collectively evaluated for impairment	8,555		7,687
Total	8,677	8,355	7,825	7,454	7,387	7,302
Individually evaluated for impairment	1,989		854
Collectively evaluated for impairment	695,086		628,011
Total loans	697,075		628,865
Residential mortgage loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,612		3,130
Total	3,612	3,493	3,130	2,894	2,816	2,593
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	413,652		365,145
Total loans	413,652		365,145
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,164		1,130
Total	1,164	1,149	1,130	1,141	1,083	925
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	118,497		109,855
Total loans	118,497		109,855
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	$ 0	0	$ 0	$ 0	$ 183
Total
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	447		332
Collectively evaluated for impairment	14,541		13,224
Total	14,988		13,556
Individually evaluated for impairment	3,182		1,459
Collectively evaluated for impairment	1,267,093		1,146,405
Total loans	$ 1,270,275		$ 1,147,864