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Securities - Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost
1 year or less	$ 58,441
1 year – 5 years	165,901
5 years – 10 years	45,747
After 10 years	1,974
Total, Amortized Cost	272,063
Total debt securities, Amortized Cost	456,756	$ 409,110
Fair Value
1 year or less	58,328
1 year – 5 years	165,331
5 years – 10 years	45,967
After 10 years	1,928
Total, Fair Value	271,554
Total debt securities, Fair Value	450,895	409,709
Residential & multi-family mortgage
Amortized Cost
Mortgage & asset backed securities, Amortized Cost	150,632
Total debt securities, Amortized Cost	150,632	111,214
Fair Value
Mortgage & asset backed securities, Fair Value	146,467
Total debt securities, Fair Value	146,467	109,636
Pooled SBA
Amortized Cost
Mortgage & asset backed securities, Amortized Cost	33,041
Total debt securities, Amortized Cost	33,041	36,260
Fair Value
Mortgage & asset backed securities, Fair Value	31,939
Total debt securities, Fair Value	31,939	36,040
Other
Amortized Cost
Mortgage & asset backed securities, Amortized Cost	1,020
Total debt securities, Amortized Cost	1,020	1,020
Fair Value
Mortgage & asset backed securities, Fair Value	935
Total debt securities, Fair Value	$ 935	$ 962

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