Business Combinations - Narrative (Details)				3 Months Ended
	May 01, 2018 USD ($) payment	Dec. 15, 2017 USD ($) shares	May 24, 2017 USD ($) payment	Mar. 31, 2018 USD ($)
Domenick
Business Acquisition [Line Items]
Consideration paid	$ 1,456,000
Cash paid at closing	$ 750,000
Number of contingent cash payments | payment	3
Maximum contingent payment per period	$ 250,000
RBPI
Business Acquisition [Line Items]
Consideration paid		$ 138,740,000
Shares issued (in shares) | shares		3,101,316
Cash in lieu of fractional shares		$ 7,000
Cash-out of certain options		$ 112,000
Warrants converted by acquirer | shares		1,368,040
Fair value of warrants assumed		$ 1,853,000
Number of securities called by warrants | shares		140,224
Goodwill, expected tax deductible amount		$ 0
Loans held for investment, increase in nonaccretable difference				$ 3,000,000
Certain loans acquired in transfer accounted for as debt securities, accretable yield, period increase (decrease)				$ 207,000
RBPI | Common Class A
Business Acquisition [Line Items]
Conversion ratio of shares in acquirer		0.1025
RBPI | Common Class B
Business Acquisition [Line Items]
Conversion ratio of shares in acquirer		0.1179
Hirshorn
Business Acquisition [Line Items]
Consideration paid			$ 7,460,000
Cash paid at closing			$ 5,770,000
Number of contingent cash payments | payment			3
Contingent consideration, maximum amount of installment payment per period			$ 575,000