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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 39,038	$ 54,842
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	8,504,574	8,218,651
Past Due Loans	18,648	28,258
Nonaccrual Loans	39,038	54,842
Total Loans	8,562,260	8,301,751
Secured Loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	23,982	35,504
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	3,471,016	3,267,709
Past Due Loans	7,397	9,488
Nonaccrual Loans	23,982	35,504
Total Loans	3,502,395	3,312,701
Unsecured Loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	15	9
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	128,865	111,868
Past Due Loans	438	240
Nonaccrual Loans	15	9
Total Loans	129,318	112,117
One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	860	1,158
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	274,537	233,941
Past Due Loans	3,321	927
Nonaccrual Loans	860	1,158
Total Loans	278,718	236,026
Commercial Land [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	2,565	2,261
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	289,574	283,416
Past Due Loans	0	0
Nonaccrual Loans	2,565	2,261
Total Loans	292,139	285,677
Income Property Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,814	2,721
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	1,946,429	1,910,505
Past Due Loans	1,022	7,250
Nonaccrual Loans	1,814	2,721
Total Loans	1,949,265	1,920,476
Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	7,464	9,922
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	1,640,358	1,606,085
Past Due Loans	3,492	1,744
Nonaccrual Loans	7,464	9,922
Total Loans	1,651,314	1,617,751
Land And Acquisition [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0	318
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	1,683	4,099
Past Due Loans	0	0
Nonaccrual Loans	0	318
Total Loans	1,683	4,417
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	199,154	212,303
Past Due Loans	0	93
Nonaccrual Loans	0	0
Total Loans	199,154	212,396
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	163,074	194,912
Past Due Loans	0	0
Nonaccrual Loans	0	0
Total Loans	163,074	194,912
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	87,561	79,805
Past Due Loans	2,204	7,258
Nonaccrual Loans	0	0
Total Loans	89,765	87,063
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	2,338	2,949
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	302,323	314,008
Past Due Loans	774	1,258
Nonaccrual Loans	2,338	2,949
Total Loans	305,435	318,215
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	6,531	6,299
Financial Asset, 60 to 89 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	3,294	3,624
Financial Asset, 60 to 89 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	352	233
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	2,241
Financial Asset, 60 to 89 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	511	0
Financial Asset, 60 to 89 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	2,204	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	170	201
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	12,117	21,959
Financial Asset, 30 to 59 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	4,103	5,864
Financial Asset, 30 to 59 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	438	240
Financial Asset, 30 to 59 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	2,969	694
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	1,022	5,009
Financial Asset, 30 to 59 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	2,981	1,744
Financial Asset, 30 to 59 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	93
Financial Asset, 30 to 59 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	7,258
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	604	1,057
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Past Due Loans	$ 0	$ 0

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