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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Securities available for sale	$ 516,863	$ 409,709
U.S. Gov’t sponsored entities
Amortized Cost
Securities available for sale	132,694	108,148
State & political subdivisions
Amortized Cost
Securities available for sale	136,031	137,723
Residential & multi-family mortgage
Amortized Cost
Securities available for sale	206,053	109,636
Pooled SBA
Amortized Cost
Securities available for sale	29,374	36,040
Corporate notes & bonds
Amortized Cost
Securities available for sale	11,777	17,200
Fair Value, Measurements, Recurring
Amortized Cost
Securities available for sale	516,863	409,709
Interest rate swaps	485	149
Trading Securities:
Trading securities	7,786	7,150
Liabilities
Interest rate swaps	(686)	(310)
Fair Value, Measurements, Recurring | U.S. Gov’t sponsored entities
Amortized Cost
Securities available for sale	132,694	108,148
Trading Securities:
Trading securities	51	52
Fair Value, Measurements, Recurring | State & political subdivisions
Amortized Cost
Securities available for sale	136,031	137,723
Fair Value, Measurements, Recurring | Residential & multi-family mortgage
Amortized Cost
Securities available for sale	206,053	109,636
Fair Value, Measurements, Recurring | Corporate notes and bonds
Amortized Cost
Securities available for sale	11,777	17,200
Fair Value, Measurements, Recurring | Pooled SBA
Amortized Cost
Securities available for sale	29,374	36,040
Fair Value, Measurements, Recurring | Other
Amortized Cost
Securities available for sale	934	962
Fair Value, Measurements, Recurring | Corporate equity securities
Trading Securities:
Trading securities	5,828	5,125
Fair Value, Measurements, Recurring | Mutual funds
Trading Securities:
Trading securities	1,058	1,499
Fair Value, Measurements, Recurring | Certificates of deposit
Trading Securities:
Trading securities	268	220
Fair Value, Measurements, Recurring | Corporate notes & bonds
Trading Securities:
Trading securities	581	254
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Amortized Cost
Securities available for sale	934	962
Interest rate swaps	0	0
Trading Securities:
Trading securities	7,735	7,098
Liabilities
Interest rate swaps	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Gov’t sponsored entities
Amortized Cost
Securities available for sale	0	0
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | State & political subdivisions
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential & multi-family mortgage
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes and bonds
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled SBA
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Amortized Cost
Securities available for sale	934	962
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate equity securities
Trading Securities:
Trading securities	5,828	5,125
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
Trading Securities:
Trading securities	1,058	1,499
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit
Trading Securities:
Trading securities	268	220
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes & bonds
Trading Securities:
Trading securities	581	254
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Amortized Cost
Securities available for sale	515,929	408,747
Interest rate swaps	485	149
Trading Securities:
Trading securities	51	52
Liabilities
Interest rate swaps	(686)	(310)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Gov’t sponsored entities
Amortized Cost
Securities available for sale	132,694	108,148
Trading Securities:
Trading securities	51	52
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | State & political subdivisions
Amortized Cost
Securities available for sale	136,031	137,723
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential & multi-family mortgage
Amortized Cost
Securities available for sale	206,053	109,636
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes and bonds
Amortized Cost
Securities available for sale	11,777	17,200
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Pooled SBA
Amortized Cost
Securities available for sale	29,374	36,040
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate equity securities
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes & bonds
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Amortized Cost
Securities available for sale	0	0
Interest rate swaps	0	0
Trading Securities:
Trading securities	0	0
Liabilities
Interest rate swaps	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Gov’t sponsored entities
Amortized Cost
Securities available for sale	0	0
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | State & political subdivisions
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential & multi-family mortgage
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate notes and bonds
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Pooled SBA
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other
Amortized Cost
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate equity securities
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Certificates of deposit
Trading Securities:
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate notes & bonds
Trading Securities:
Trading securities	$ 0	$ 0

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