Loans Receivable and Allowance for Credit Losses (Details 7) - Loans Receivable - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 19,311	$ 8,320	$ 22,404	$ 47,567
Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	7,026	6,360	8,520	39,099
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	12,285	803	13,884	2,789
Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	1,157	0	5,679
CRE
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	7,436	1,494	21,090
CRE | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	6,279	1,494	19,932
CRE | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	0
CRE | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	1,157	0	1,158
C&I
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	15,673	81	17,272	25,066
C&I | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	3,388	81	3,388	18,559
C&I | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	12,285	0	13,884	1,986
C&I | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	4,521
Residential
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	3,638	803	3,638	1,071
Residential | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	3,638	0	3,638	268
Residential | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	803	0	803
Residential | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	0
Consumer
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	340
Consumer | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	340
Consumer | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	0
Consumer | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0