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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
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, 2018 and December 31, 2017:
(Dollars in thousands)
June 30, 2018
 
December 31, 2017
Unused commitments to extend credit
$
10,119,455

 
$
9,629,365

Standby letters of credit
87,574

 
81,530

Unfunded commitments for investments in affordable housing projects
77,622

 
61,819