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Loans Receivable and Allowance for Loan Losses - Summary of Recorded Investment Net Charge-Offs, Unpaid Principal Balance and Related Allowance for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, Total	$ 34,460		$ 38,435
Unpaid Principal Balance
Unpaid Principal Balance, Total	35,162		39,089
Related Allowance	2,119		1,451
Average Recorded Investment
Average Recorded Investment, Total	36,448	$ 34,387
Interest Income Recognized
Interest Income Recognized, Total	158	333
Commercial and industrial
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	5,830		9,138
Recorded Investment Net of Charge Offs, With an allowance recorded	8,458		8,323
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	6,029		9,287
Unpaid Principal Balance, With an allowance recorded	8,642		8,506
Related Allowance	986		650
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	7,484	4,248
Average Recorded Investment, With an allowance recorded	8,390	8,837
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	50
Interest Income Recognized, With an allowance recorded	1	81
Commercial real estate - owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	614		806
Recorded Investment Net of Charge Offs, With an allowance recorded	869		642
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	614		806
Unpaid Principal Balance, With an allowance recorded	869		642
Related Allowance	764		642
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	710	1,435
Average Recorded Investment, With an allowance recorded	756	844
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	15
Interest Income Recognized, With an allowance recorded	1	1
Commercial real estate - non-owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	242		160
Recorded Investment Net of Charge Offs, With an allowance recorded			0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	353		272
Unpaid Principal Balance, With an allowance recorded			0
Related Allowance			0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	201	1,794
Average Recorded Investment, With an allowance recorded		138
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	2
Interest Income Recognized, With an allowance recorded		0
Other
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	97		30
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	97		30
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	63	57
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	0
Residential real estate
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	3,617		3,628
Recorded Investment Net of Charge Offs, With an allowance recorded	4,625		5,619
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	3,788		3,801
Unpaid Principal Balance, With an allowance recorded	4,662		5,656
Related Allowance	365		155
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	3,623	4,502
Average Recorded Investment, With an allowance recorded	5,122	2,597
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	1
Interest Income Recognized, With an allowance recorded	25	39
Manufactured housing
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	9,886		9,865
Recorded Investment Net of Charge Offs, With an allowance recorded	222		224
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	9,886		9,865
Unpaid Principal Balance, With an allowance recorded	222		224
Related Allowance	4		$ 4
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	9,876	9,833
Average Recorded Investment, With an allowance recorded	223	102
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	131	141
Interest Income Recognized, With an allowance recorded	$ 0	$ 3

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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