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Deposits (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Deposits [Line Items]
Deposits	$ 1,408,903	$ 1,394,331
Average balance, deposits	$ 1,384,537	$ 1,459,067
Deposits, weighted average interest rate during the period	0.99%	0.74%
Non-interest-bearing transaction accounts
Deposits [Line Items]
Deposits	$ 233,915	$ 277,445
Average balance, deposits	$ 236,208	$ 230,907
Deposits, weighted average interest rate during the period	0.00%	0.00%
Interest-bearing transaction accounts
Deposits [Line Items]
Deposits	$ 256,303	$ 217,625
Average balance, deposits	$ 278,042	$ 226,540
Deposits, weighted average interest rate during the period	0.87%	0.59%
Money market accounts
Deposits [Line Items]
Deposits	$ 475,322	$ 515,077
Average balance, deposits	$ 487,395	$ 583,241
Deposits, weighted average interest rate during the period	0.91%	0.47%
Certificates of deposit
Deposits [Line Items]
Deposits	$ 111,311	$ 76,199
Average balance, deposits	$ 80,630	$ 56,667
Deposits, weighted average interest rate during the period	1.42%	1.00%
Wholesale deposits
Deposits [Line Items]
Deposits	$ 332,052	$ 307,985
Average balance, deposits	$ 302,262	$ 361,712
Deposits, weighted average interest rate during the period	1.88%	1.70%

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- Definition

Average Balance, Deposits

+ References

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- Definition

Deposits, Weighted Average Interest Rate During the Period

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- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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