Income Taxes, Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Nov. 18, 2016	Dec. 31, 2015
Deferred Tax Assets [Abstract]
Allowance for Credit Losses	$ 20,260		$ 17,529
Accrued Liabilities	9,807		8,614
Deferred Compensation	14,166		11,586
State Franchise Tax	1,680		1,549
Acquired Net Operating Loss	1,135		0
Fair Value Adjustment on Loans Acquired	429		0
Fair Value Adjustment on ORE Acquired	299		0
ORE Writedown and Holding Costs	0		1,547
Unrealized Loss on Securities Available-for-Sale	58		0
Low-Income Housing Investment	366		73
Other	233		46
Total Deferred Tax Assets	48,433		40,944
Deferred Tax Liabilities [Abstract]
Premises and Equipment	(1,707)		(869)
Securities Accretion	(341)		(310)
Unrealized Gain on Securities Available-for-Sale	0		(432)
Leasing Activities	(14,868)		(11,469)
Core Deposit Intangible Asset	(398)		0
Other	(808)		(744)
Total Deferred Tax Liabilities	(18,122)		(13,824)
Net Deferred Tax Assets	30,311		$ 27,120
Delta National Bancorp [Member]
Deferred Tax Assets [Abstract]
Acquired Net Operating Loss		$ 1,773
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards in Federal and California jurisdictions	2,700
Amount of annual limit on carryforwards to be utilized	$ 141