Loans Receivable and Allowance for Credit Losses (Details 7) - Loans Receivable - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 6,419	$ 41,034
Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	1,505	33,459
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	4,914	0
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,615
Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,960
CRE
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	1,505	13,758
CRE | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	1,505	13,730
CRE | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
CRE | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
CRE | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	28
C&I
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	4,914	26,659
C&I | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	19,112
C&I | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	4,914	0
C&I | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,615
C&I | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,932
Residential
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	272
Residential | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	272
Residential | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Residential | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	345
Consumer | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	345
Consumer | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 0	$ 0