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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 33,060
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	2,018
Commercial business: Secured loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	26,615
Commercial business: Unsecured loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	359
Real estate: One-to-four family residential [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	591
Real estate: Commercial and multifamily residential: Commercial land [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,985
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,287
Real estate construction: One-to-four family residential: Land and acquisition [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0
Real estate construction: One-to-four family residential: Residential construction [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0
Real estate: Commercial and multifamiIy residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	205
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	8,609,241	$ 8,218,651
Total Past Due	23,648	28,258
Nonaccrual Loans	33,060	54,842
Financing Receivable, after Allowance for Credit Loss	8,665,949	8,301,751
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	88,389	194,912
Total Past Due	0	0
Nonaccrual Loans	0	0
Financing Receivable, after Allowance for Credit Loss	88,389	194,912
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	290,174	314,008
Total Past Due	379	1,258
Nonaccrual Loans	2,018	2,949
Financing Receivable, after Allowance for Credit Loss	292,571	318,215
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	3,422,313	3,267,709
Total Past Due	12,719	9,488
Nonaccrual Loans	26,615	35,504
Financing Receivable, after Allowance for Credit Loss	3,461,647	3,312,701
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	128,852	111,868
Total Past Due	472	240
Nonaccrual Loans	359	9
Financing Receivable, after Allowance for Credit Loss	129,683	112,117
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	261,886	233,941
Total Past Due	2,418	927
Nonaccrual Loans	591	1,158
Financing Receivable, after Allowance for Credit Loss	264,895	236,026
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	300,580	283,416
Total Past Due	625	0
Nonaccrual Loans	1,985	2,261
Financing Receivable, after Allowance for Credit Loss	303,190	285,677
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	1,795,771	1,606,085
Total Past Due	4,287	1,744
Nonaccrual Loans	1,287	9,922
Financing Receivable, after Allowance for Credit Loss	1,801,345	1,617,751
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	1,364	4,099
Total Past Due	0	0
Nonaccrual Loans	0	318
Financing Receivable, after Allowance for Credit Loss	1,364	4,417
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	189,350	212,303
Total Past Due	951	93
Nonaccrual Loans	0	0
Financing Receivable, after Allowance for Credit Loss	190,301	212,396
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	2,057,359	1,910,505
Total Past Due	1,797	7,250
Nonaccrual Loans	205	2,721
Financing Receivable, after Allowance for Credit Loss	2,059,361	1,920,476
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Current Loans	73,203	79,805
Total Past Due	0	7,258
Nonaccrual Loans	0	0
Financing Receivable, after Allowance for Credit Loss	73,203	87,063
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	18,182	21,959
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	284	1,057
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	7,684	5,864
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	392	240
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	2,162	694
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	625	0
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	4,287	1,744
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	951	93
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	1,797	5,009
Financial Asset, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	7,258
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	5,466	6,299
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	95	201
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	5,035	3,624
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	80	0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	256	233
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	2,241
Financial Asset, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
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]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Secured loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial business: Unsecured loans [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamily residential: Commercial land [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Land and acquisition [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: One-to-four family residential: Residential construction [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: Commercial and multifamiIy residential: Income property [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate construction: Commercial and multifamily residential: Owner occupied [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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