Mortgage Servicing Rights (Tables)

12 Months Ended

Dec. 31, 2016

Transfers And Servicing Of Financial Assets [Abstract]

Schedule of Changes in Mortgage Servicing Rights

Changes in the Company’s mortgage servicing rights were as follows for year ended December 31, 2016, 2015 and 2014:

	Year Ended
	December 31,
		2016			2015			2014
Carrying value at beginning of period	$	29,711		$	6,032		$	—
Capitalization		46,070			26,474			6,429
Amortization		(8,321	)		(2,601	)		(397	)
Sales		(34,118	)		—			—
Gain on sale		3,406			—			—
Impairment		(4,678	)		(194	)		—
Carrying value at December 31	$	32,070		$	29,711		$	6,032

Schedule of Servicing Income and Expense Included in Mortgage Banking Income

The following table summarizes servicing income and expense included in mortgage banking income and other noninterest expense within the Mortgage Segment operating results, respectively, for the years ended December 31, 2016, 2015 and 2014, respectively:

	Year Ended
	December 31,
		2016			2015		2014
Gross servicing income	$	12,063		$	3,614	$	341
Servicing expenses:
Servicing asset amortization		8,321			2,601		397
Servicing asset impairment		4,678			194		—
Loss on sale of mortgage servicing rights		4,447			—		—
Other servicing expenses		2,325			633	140
Gross servicing expenses		19,771			3,428		537
Net servicing (loss) income	$	(7,708	)	$	186	$	(196	)

Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights

Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31, 2016 and 2015 are as follows:

	As of December 31,
	2016			2015
Unpaid principal balance	$	2,833,958		$	2,545,449
Weighted-average prepayment speed (CPR)		8.40	%		7.30	%
Estimated impact on fair value of a 10% increase		(1,256	)		(371	)
Estimated impact on fair value of a 20% increase		(2,434	)		(726	)
Discount rate		9.54	%		10.14	%
Estimated impact on fair value of a 100 bp increase		(1,394	)		(1,201	)
Estimated impact on fair value of a 200 bp increase		(2,679	)		(2,317	)
Weighted-average coupon interest rate		3.59	%		3.79	%
Weighted-average servicing fee (basis points)		27			25
Weighted-average remaining maturity (in months)		328			311

Summary of Transaction Resulted in Net Loss

The transaction resulted in a net loss of $4,447, which is composed of the following:

	Year Ended
	December 31,
		2016
Gain on sale	$	3,406
Transaction costs		(2,284	)
Loss on fair value hedge on sale	$	(5,569	)
Net loss on sale of mortgage servicing rights	$	(4,447	)