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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
Security
Dec. 31, 2016
USD ($)
Security
Dec. 31, 2015
USD ($)
Security
Schedule of Investments [Line Items]      
Available-for-sale securities, Less than 12 Months: Number of Securities | Security 87 149 29
Available-for-sale securities, Less than 12 Months: Fair Value $ 89,664 $ 118,601 $ 24,049
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 1,524 $ 4,453 $ 209
Available-for-sale securities, 12 Months or More: Number of Securities | Security 10 2 18
Available-for-sale securities, 12 Months or More: Fair Value $ 7,624 $ 1,056 $ 9,911
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 195 $ 112 $ 194
Available-for-sale securities, Total: Number of Securities | Security 97 151 47
Available-for-sale securities, Total: Fair Value $ 97,288 $ 119,657 $ 33,960
Available-for-sale securities, Total: Unrealized Losses $ 1,719 $ 4,565 $ 403
Held-to-maturity securities, Less than 12 Months: Number of Securities | Security 19    
Held-to-maturity securities, Less than 12 Months: Fair Value $ 29,406    
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 113    
Held-to-maturity securities, 12 Months or More: Number of Securities | Security 0    
Held-to-maturity securities, Total: Number of Securities | Security 19    
Held-to-maturity securities, Total: Fair Value $ 29,406    
Held-to-maturity securities, Total: Unrealized Losses $ 113    
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | Security 106    
Available for Sale Securities and Held to Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value $ 119,070    
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 1,637    
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | Security 10    
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value $ 7,624    
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 195    
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | Security 116    
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value $ 126,694    
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses $ 1,832    
U.S. Treasury and U.S. government agencies [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Less than 12 Months: Number of Securities | Security 21 23 6
Available-for-sale securities, Less than 12 Months: Fair Value $ 39,077 $ 43,698 $ 6,259
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 852 $ 1,542 $ 43
Available-for-sale securities, 12 Months or More: Number of Securities | Security 1 0 2
Available-for-sale securities, 12 Months or More: Fair Value $ 2,694   $ 1,383
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 6   $ 12
Available-for-sale securities, Total: Number of Securities | Security 22 23 8
Available-for-sale securities, Total: Fair Value $ 41,771 $ 43,698 $ 7,642
Available-for-sale securities, Total: Unrealized Losses $ 858 $ 1,542 $ 55
Held-to-maturity securities, Less than 12 Months: Number of Securities | Security 2    
Held-to-maturity securities, Less than 12 Months: Fair Value $ 4,991    
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 5    
Held-to-maturity securities, 12 Months or More: Number of Securities | Security 0    
Held-to-maturity securities, Total: Number of Securities | Security 2    
Held-to-maturity securities, Total: Fair Value $ 4,991    
Held-to-maturity securities, Total: Unrealized Losses $ 5    
Mortgage-backed U.S. Government Agencies [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Less than 12 Months: Number of Securities | Security 18 18 13
Available-for-sale securities, Less than 12 Months: Fair Value $ 26,466 $ 24,321 $ 12,759
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 291 $ 579 $ 124
Available-for-sale securities, 12 Months or More: Number of Securities | Security 1 0 11
Available-for-sale securities, 12 Months or More: Fair Value $ 535   $ 6,282
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 16   $ 104
Available-for-sale securities, Total: Number of Securities | Security 19 18 24
Available-for-sale securities, Total: Fair Value $ 27,001 $ 24,321 $ 19,041
Available-for-sale securities, Total: Unrealized Losses $ 307 $ 579 $ 228
Held-to-maturity securities, Less than 12 Months: Number of Securities | Security 14    
Held-to-maturity securities, Less than 12 Months: Fair Value $ 22,879    
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 99    
Held-to-maturity securities, 12 Months or More: Number of Securities | Security 0    
Held-to-maturity securities, Total: Number of Securities | Security 14    
Held-to-maturity securities, Total: Fair Value $ 22,879    
Held-to-maturity securities, Total: Unrealized Losses $ 99    
State and political subdivision obligations [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Less than 12 Months: Number of Securities | Security 48 108 9
Available-for-sale securities, Less than 12 Months: Fair Value $ 24,121 $ 50,582 $ 4,041
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 381 $ 2,332 $ 32
Available-for-sale securities, 12 Months or More: Number of Securities | Security 7 0 3
Available-for-sale securities, 12 Months or More: Fair Value $ 3,845   $ 1,631
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 133   $ 45
Available-for-sale securities, Total: Number of Securities | Security 55 108 12
Available-for-sale securities, Total: Fair Value $ 27,966 $ 50,582 $ 5,672
Available-for-sale securities, Total: Unrealized Losses $ 514 $ 2,332 $ 77
Held-to-maturity securities, Less than 12 Months: Number of Securities | Security 3    
Held-to-maturity securities, Less than 12 Months: Fair Value $ 1,536    
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 9    
Held-to-maturity securities, 12 Months or More: Number of Securities | Security 0    
Held-to-maturity securities, Total: Number of Securities | Security 3    
Held-to-maturity securities, Total: Fair Value $ 1,536    
Held-to-maturity securities, Total: Unrealized Losses $ 9    
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Less than 12 Months: Number of Securities | Security 0 0 0
Available-for-sale securities, 12 Months or More: Number of Securities | Security 1 2 2
Available-for-sale securities, 12 Months or More: Fair Value $ 550 $ 1,056 $ 615
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 40 $ 112 $ 33
Available-for-sale securities, Total: Number of Securities | Security 1 2 2
Available-for-sale securities, Total: Fair Value $ 550 $ 1,056 $ 615
Available-for-sale securities, Total: Unrealized Losses $ 40 $ 112 $ 33
Corporate debt securities [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Less than 12 Months: Number of Securities | Security     1
Available-for-sale securities, Less than 12 Months: Fair Value     $ 990
Available-for-sale securities, Less than 12 Months: Unrealized Losses     $ 10
Available-for-sale securities, 12 Months or More: Number of Securities | Security     0
Available-for-sale securities, Total: Number of Securities | Security     1
Available-for-sale securities, Total: Fair Value     $ 990
Available-for-sale securities, Total: Unrealized Losses     $ 10