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Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Commitments
The contractual amounts of off-balance-sheet financial instruments as of December 31, 2018, and December 31, 2017, are as follows: 
(in thousands)
December 31, 2018
 
December 31, 2017
Commitments to extend credit
$
1,344,687

 
$
1,298,423

Letters of credit
44,665

 
73,790