Loans - Analysis Of Past Due Loans By Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Total Past Due	$ 1,235	$ 1,081
Current	380,286	342,718
Total	381,521	343,799
Non-Accrual Loans	974	1,062
CRE [Member]
Total Past Due	210
Current	68,858	70,194
Total	69,068	70,194
MF [Member]
Current	6,425	4,888
Total	6,425	4,888
C+I [Member]
Total Past Due	909	996
Current	52,787	23,680
Total	53,696	24,676
Non-Accrual Loans	909	996
ADL [Member]
Current	23,637	18,844
Total	23,637	18,844
RES [Member]
Total Past Due	108	85
Current	217,268	213,237
Total	217,376	213,322
Non-Accrual Loans	65	66
HELOC [Member]
Total Past Due	8
Current	9,351	10,123
Total	9,359	10,123
CON [Member]
Current	1,960	1,752
Total	1,960	1,752
30-59 Days Past Due [Member]
Total Past Due	218
30-59 Days Past Due [Member] | CRE [Member]
Total Past Due	210
30-59 Days Past Due [Member] | HELOC [Member]
Total Past Due	8
60-89 Days Past Due [Member]
Total Past Due	43	19
60-89 Days Past Due [Member] | RES [Member]
Total Past Due	43	19
Greater than 90 Days [Member]
Total Past Due	974	1,062
Greater than 90 Days [Member] | C+I [Member]
Total Past Due	909	996
Greater than 90 Days [Member] | RES [Member]
Total Past Due	$ 65	$ 66