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Junior Subordinated Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of Terms and Recorded Balance of Subordinated Debenture The following table summarizes the terms and recorded balance of each subordinated debenture as of the date indicated (dollars in thousands):
   Coupon Rate
(Variable) 3 mo. LIBOR +		As of December 31, 2019December 31, 2018
Subordinated Debt SeriesMaturity
Date		Face
Value		Current
Coupon Rate		Recorded
Book Value		Recorded
Book Value
TriCo Cap Trust I10/7/2033$20,619  3.05 %5.04 %$20,619  $20,619  
TriCo Cap Trust II7/23/203420,619  2.55 %4.48 %20,619  20,619  
North Valley Trust II4/24/20336,186  3.25 %5.16 %5,215  5,174  
North Valley Trust III4/24/20345,155  2.80 %4.73 %4,118  4,079  
North Valley Trust IV3/15/203610,310  1.33 %3.22 %6,661  6,551  
$62,889  $57,232  $57,042