Loans - Estimated Expected Future Cash Flows Of Each PCI Loan Pool (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
90 Days or More Past Due and Accruing	$ 60	$ 15
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	7,321	8,807
90 Days or More Past Due and Accruing	60	15
Total Non-Performing Loans	7,381	8,822
Non-Performing Loans | Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	6,571	8,378
90 Days or More Past Due and Accruing	52	15
Total Non-Performing Loans	6,623	8,393
Non-Performing Loans | Loans Held For Investment | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	5,223	5,232
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	5,223	5,232
Non-Performing Loans | Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	5,223	5,232
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	5,223	5,232
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	1,209	2,145
90 Days or More Past Due and Accruing	52	0
Total Non-Performing Loans	1,261	2,145
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		1,109
90 Days or More Past Due and Accruing		0
Total Non-Performing Loans		1,109
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	1,209	1,109
90 Days or More Past Due and Accruing	9	0
Total Non-Performing Loans	1,218	1,109
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		1,036
90 Days or More Past Due and Accruing		0
Total Non-Performing Loans		1,036
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	1,036
90 Days or More Past Due and Accruing	43	0
Total Non-Performing Loans	43	1,036
Non-Performing Loans | Loans Held For Investment | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		113
90 Days or More Past Due and Accruing		0
Total Non-Performing Loans		113
Non-Performing Loans | Loans Held For Investment | Construction and land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		113
90 Days or More Past Due and Accruing		0
Total Non-Performing Loans		113
Non-Performing Loans | Loans Held For Investment | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	43	559
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	43	559
Non-Performing Loans | Loans Held For Investment | Multifamily | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	40
90 Days or More Past Due and Accruing	0
Total Non-Performing Loans	40
Non-Performing Loans | Loans Held For Investment | Multifamily | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	3	559
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	3	559
Non-Performing Loans | Loans Held For Investment | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	96	329
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	96	329
Non-Performing Loans | Loans Held For Investment | Home equity and lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	96	329
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	96	329
Non-Performing Loans | Loans Held For Investment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
90 Days or More Past Due and Accruing		15
Total Non-Performing Loans		15
Non-Performing Loans | Loans Held For Investment | Commercial and Industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
90 Days or More Past Due and Accruing		15
Total Non-Performing Loans		15
Non-Performing Loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	750	429
90 Days or More Past Due and Accruing	8	0
Total Non-Performing Loans	758	429
Non-Performing Loans | Acquired Loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	290
90 Days or More Past Due and Accruing	0
Total Non-Performing Loans	290
Non-Performing Loans | Acquired Loans | Commercial mortgage | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	231
90 Days or More Past Due and Accruing	0
Total Non-Performing Loans	231
Non-Performing Loans | Acquired Loans | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	59
90 Days or More Past Due and Accruing	0
Total Non-Performing Loans	59
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	420	429
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	420	429
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	420	429
90 Days or More Past Due and Accruing	0	0
Total Non-Performing Loans	420	429
Non-Performing Loans | Acquired Loans | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	31
90 Days or More Past Due and Accruing	8
Total Non-Performing Loans	39
Non-Performing Loans | Acquired Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	9
90 Days or More Past Due and Accruing	0
Total Non-Performing Loans	9
Non-Performing Loans | 0-29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	1,185	2,038
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	765	1,609
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	341	344
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	341	344
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	384	1,265
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		364
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	384	364
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		901
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	901
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Construction and land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	40	0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Multifamily | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	40
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Multifamily | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Home equity and lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 0-29 Days Past Due | Loans Held For Investment | Commercial and Industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	420	429
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | Commercial mortgage | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	420	429
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	420	429
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 0-29 Days Past Due | Acquired Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	479	687
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	479	687
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	372
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	372
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	383	315
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		180
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	383	180
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		135
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	135
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Construction and land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Multifamily | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Multifamily | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	96	0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Home equity and lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	96	0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 30-89 Days Past Due | Loans Held For Investment | Commercial and Industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | Commercial mortgage | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 30-89 Days Past Due | Acquired Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	5,657	6,082
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	5,327	6,082
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	4,882	4,516
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	4,882	4,516
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	442	565
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		565
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	442	565
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		113
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Construction and land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		113
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	3	559
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Multifamily | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Multifamily | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	3	559
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	329
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Home equity and lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	329
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 90 Days or More Past Due | Loans Held For Investment | Commercial and Industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans		0
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	330	0
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	290
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | Commercial mortgage | Less Than 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	231
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	59
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	0
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	0	$ 0
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	31
Non-Performing Loans | 90 Days or More Past Due | Acquired Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing Loans	$ 9