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Fair Value Measurements (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity investment securities $ 71,199 $ 0  
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity investment securities 71,199    
Deposits 988,200 935,075 $ 777,320
Short-term borrowings 21,468    
Long-term debt 12,149 13,614 39,626
Subordinated debt 7,420 7,534  
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net loans and leases 874,192 824,293 738,773
Carrying Value [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity investment securities 71,096    
Net loans and leases 854,594 806,741 730,345
Deposits 987,468 935,373 777,043
Short-term borrowings 21,468   31,596
Long-term debt 13,467 13,581 40,305
Subordinated debt 7,419 7,414 7,500
Fair Value [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Held-to-maturity investment securities 71,199    
Net loans and leases 874,192 824,293 738,773
Deposits 988,200 935,075 777,320
Short-term borrowings 21,468   31,596
Long-term debt 12,149 13,614 39,626
Subordinated debt $ 7,420 $ 7,534 $ 7,500