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Income Taxes Reconciliation between Statutory Federal Income Tax Rate and Company's Effective Tax Rate (Tables)
 12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
 
 
(in thousands)
Income tax at statutory rate
 
$
90,489

 
$
69,125

 
$
50,979

Increase (decrease) resulting from:
 
 
 
 
 
 
State income taxes, net of federal benefits
 
5,783

 
4,904

 
3,016

Bank owned life insurance
 
(1,365
)
 
(1,578
)
 
(1,683
)
Tax-exempt income
 
(20,226
)
 
(15,006
)
 
(7,308
)
Deferred tax asset valuation allowance
 
(2,290
)
 
(2,104
)
 
(2,391
)
Bargain purchase gain
 
—

 
—

 
(3,775
)
Low income housing tax credits
 
(5,223
)
 
(3,872
)
 
(2,105
)
Tax benefit related to Western Liberty acquisition
 
—

 
—

 
(3,738
)
Other, net
 
(2,874
)
 
(3,079
)
 
(3,165
)
Total tax provision
 
$
64,294

 
$
48,390

 
$
29,830