Loans Receivable and Allowance for Credit Losses (Non-PCI TDR Modifications) (Details) - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	$ 2,777	$ 19,311	$ 2,777	$ 22,404
Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,529	7,026	1,529	8,520
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	12,285	0	13,884
Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	6,722
Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	411	0	411	0
Commercial lending
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	19,311	837	22,404
Commercial lending | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	7,026	0	8,520
Commercial lending | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	12,285	0	13,884
Commercial lending | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	0
Commercial lending | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	15,673	0	17,272
Commercial lending | Commercial and industrial (“C&I”) | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	3,388	0	3,388
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	12,285	0	13,884
Commercial lending | Commercial and industrial (“C&I”) | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial and industrial (“C&I”) | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	1,494
Commercial lending | Commercial real estate (“CRE”) | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	1,494
Commercial lending | Commercial real estate (“CRE”) | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial real estate (“CRE”) | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	0
Commercial lending | Commercial real estate (“CRE”) | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Real estate loan | Multifamily
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	3,638	0	3,638
Commercial lending | Real estate loan | Multifamily | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	3,638	0	3,638
Commercial lending | Real estate loan | Multifamily | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Real estate loan | Multifamily | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Real estate loan | Multifamily | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,940	0	1,940	0
Consumer lending | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,529	0	1,529	0
Consumer lending | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	846
Consumer lending | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	411	0	411	0
Consumer lending | Real estate loan | Single-family
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	404	0	404	0
Consumer lending | Real estate loan | Single-family | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	65	0	65	0
Consumer lending | Real estate loan | Single-family | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | Real estate loan | Single-family | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | Real estate loan | Single-family | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	339	0	339	0
Consumer lending | HELOCs
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,536	0	1,536	0
Consumer lending | HELOCs | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,464	0	1,464	0
Consumer lending | HELOCs | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | HELOCs | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | HELOCs | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	$ 72	$ 0	$ 72	$ 0