Securities (Amortized Cost and Fair Value of AFS and HTM Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities [Line Items]
Available-for-sale, amortized cost	$ 410,275	$ 196,504
Available-for-sale, gross unrealized gains	1,681	434
Available-for-sale, gross unrealized (losses)	(4,510)	(2,848)
Available-for-sale, estimated fair value	407,446	194,090
Held-to-maturity, amortized cost	15,721	9,200
Held-to-maturity, gross unrealized gains	684	112
Held-to-maturity, gross unrealized (losses)	(26)	(19)
Held-to-maturity, estimated fair value	16,379	9,293
US Treasury Securities [Member]
Securities [Line Items]
Available-for-sale, amortized cost	50
Available-for-sale, gross unrealized gains	0
Available-for-sale, gross unrealized (losses)	0
Available-for-sale, estimated fair value	50
US Government Agencies Short-term Debt Securities [Member]
Securities [Line Items]
Available-for-sale, amortized cost	5,086	5,106
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized (losses)	(21)	(112)
Available-for-sale, estimated fair value	5,065	4,994
Held-to-maturity, amortized cost	5,000	5,000
Held-to-maturity, gross unrealized gains	9	46
Held-to-maturity, gross unrealized (losses)	0	0
Held-to-maturity, estimated fair value	5,009	5,046
Commercial Mortgage Backed Securities [Member]
Securities [Line Items]
Available-for-sale, amortized cost	263,004	120,794
Available-for-sale, gross unrealized gains	66	177
Available-for-sale, gross unrealized (losses)	(2,615)	(1,164)
Available-for-sale, estimated fair value	260,455	119,807
Corporate Bond Securities [Member]
Securities [Line Items]
Available-for-sale, amortized cost	4,486	8,631
Available-for-sale, gross unrealized gains	5	35
Available-for-sale, gross unrealized (losses)	(9)	0
Available-for-sale, estimated fair value	4,482	8,666
Asset-backed Securities [Member]
Securities [Line Items]
Available-for-sale, amortized cost	34,092	13,105
Available-for-sale, gross unrealized gains	19	17
Available-for-sale, gross unrealized (losses)	(511)	(258)
Available-for-sale, estimated fair value	33,600	12,864
Certificates of Deposit [Member]
Securities [Line Items]
Available-for-sale, amortized cost	1,976	1,976
Available-for-sale, gross unrealized gains	5	33
Available-for-sale, gross unrealized (losses)	0	0
Available-for-sale, estimated fair value	1,981	2,009
Municipals [Member]
Securities [Line Items]
Available-for-sale, amortized cost	100,081	45,392
Available-for-sale, gross unrealized gains	1,586	172
Available-for-sale, gross unrealized (losses)	(1,233)	(1,205)
Available-for-sale, estimated fair value	100,434	44,359
Held-to-maturity, amortized cost	10,721	4,200
Held-to-maturity, gross unrealized gains	675	66
Held-to-maturity, gross unrealized (losses)	(26)	(19)
Held-to-maturity, estimated fair value	11,370	4,247
CRA Mutual Fund [Member]
Securities [Line Items]
Available-for-sale, amortized cost	1,500	1,500
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized (losses)	(121)	(109)
Available-for-sale, estimated fair value	$ 1,379	$ 1,391

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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