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Commitments and Contingencies Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]  
Schedule of fair falue for off-balance sheet risks
The following table presents the commitments to extend credit and unfunded commitments as of June 30, 2017 and December 31, 2016:
(Dollars in thousands)
June 30, 2017
 
December 31, 2016
Unused commitments to extend credit
$
9,189,347

 
$
8,808,218

Standby letters of credit
81,099

 
83,750

Unfunded commitments for investments in affordable housing projects
67,363

 
57,079