Loan Servicing (Tables)

12 Months Ended

Dec. 31, 2016

Transfers and Servicing [Abstract]

Schedule of mortgage servicing rights measured using amortization method with aggregate activity in related valuation allowances

	2016			2015
Mortgage servicing rights
Balance, beginning of year	$	645,067		$	689,603
Additions		87,579			73,650
Write-downs		(72,580	)		—
Amortization		(107,239	)		(118,186	)
Balance at end of year		552,827			645,067
Valuation allowances
Balance at beginning of year		47,354			56,969
Additions due to decreases in market value		38,967			—
Reduction due to write-downs		(72,580	)		—
Reduction due to payoff of loans		(13,741	)		(9,615	)
Balances at end of year		0			47,354
Mortgage servicing assets, net	$	552,827		$	597,713
Fair value disclosures
Fair value as of the beginning of the period	$	870,619		$	979,699
Fair value as of the end of the period	$	898,625		$	870,619