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Loans - Impaired Loans - Recorded Investment, Unpaid Principal Balance and Related Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Recorded Investment
With no related allowance recorded	$ 14,855	$ 21,238
With an allowance recorded	5,257	1,049
Total impaired loans	20,112	22,287
Unpaid Principal Balance
With no related allowance recorded	17,792	25,321
With an allowance recorded	5,257	1,448
Total impaired loans	23,049	26,769
Related Allowance
With an allowance recorded	144	1,049
Multifamily
Recorded Investment
With no related allowance recorded	4,723
Unpaid Principal Balance
With no related allowance recorded	4,965
Commercial
Recorded Investment
With no related allowance recorded		240
Unpaid Principal Balance
With no related allowance recorded		388
Lease financing receivables
Recorded Investment
With no related allowance recorded	178	366
Unpaid Principal Balance
With no related allowance recorded	213	371
Real estate - commercial | Owner occupied general purpose
Recorded Investment
With no related allowance recorded	455	1,881
Unpaid Principal Balance
With no related allowance recorded	495	2,131
Real estate - commercial | Owner occupied special purpose
Recorded Investment
With no related allowance recorded	342	385
Unpaid Principal Balance
With no related allowance recorded	498	518
Real estate - commercial | Non-owner occupied general purpose
Recorded Investment
With no related allowance recorded	1,163	1,744
With an allowance recorded		246
Unpaid Principal Balance
With no related allowance recorded	1,538	2,010
With an allowance recorded		595
Related Allowance
With an allowance recorded		246
Real estate - commercial | Non-owner occupied special purpose
Recorded Investment
With no related allowance recorded		1,013
Unpaid Principal Balance
With no related allowance recorded		1,649
Real estate - commercial | Retail properties
Recorded Investment
With no related allowance recorded	1,081	1,179
Unpaid Principal Balance
With no related allowance recorded	1,177	1,235
Real estate - residential | Investor
Recorded Investment
With no related allowance recorded	372	1,841
With an allowance recorded	829
Unpaid Principal Balance
With no related allowance recorded	676	2,308
With an allowance recorded	829
Related Allowance
With an allowance recorded	10
Real estate - residential | Owner occupied
Recorded Investment
With no related allowance recorded	5,208	9,824
With an allowance recorded	3,443	803
Unpaid Principal Balance
With no related allowance recorded	6,680	11,391
With an allowance recorded	3,443	853
Related Allowance
With an allowance recorded	43	803
Real estate - residential | Revolving and junior liens
Recorded Investment
With no related allowance recorded	1,125	2,484
With an allowance recorded	985
Unpaid Principal Balance
With no related allowance recorded	1,313	3,018
With an allowance recorded	985
Related Allowance
With an allowance recorded	91
Consumer
Recorded Investment
With no related allowance recorded	7
Unpaid Principal Balance
With no related allowance recorded	8
Construction Loans | Real estate - commercial | Commercial speculative
Recorded Investment
With no related allowance recorded		74
Unpaid Principal Balance
With no related allowance recorded		81
Construction Loans | Real estate - commercial | All other
Recorded Investment
With no related allowance recorded	201	207
Unpaid Principal Balance
With no related allowance recorded	$ 229	$ 221

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