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Derivative Financial Instruments, Agency Business (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) item
Derivative Financial Instruments
Notional Value, classified in Other Assets	$ 155,202		$ 155,202		$ 77,984
Notional Value, classified in Other Liabilities	413,694		413,694		291,421
Net gains (losses) from changes in the fair value of derivatives	(4,400)	$ (200)	2,300	$ (2,300)
Income from mortgage servicing rights	25,216	$ 18,897	62,787	$ 56,182
Agency Business
Derivative Financial Instruments
Notional Value, classified in Other Assets	568,896		568,896		369,405
Fair Value, classified in Other Assets	926		926		684
Fair Value, classified in Other Liabilities	$ (3,406)		$ (3,406)		$ (1,306)
Non-Qualifying | Rate lock commitments | Agency Business
Derivative Financial Instruments
Count | item	6		6		3
Notional Value, classified in Other Assets	$ 37,965		$ 37,965		$ 38,578
Fair Value, classified in Other Assets	749		749		276
Fair Value, classified in Other Liabilities	$ (28)		$ (28)		$ (278)
Non-Qualifying | Forward Sale Commitments | Agency Business
Derivative Financial Instruments
Count | item	57		57		75
Notional Value, classified in Other Assets	$ 530,931		$ 530,931		$ 330,827
Fair Value, classified in Other Assets	177		177		408
Fair Value, classified in Other Liabilities	$ (3,378)		$ (3,378)		$ (1,028)

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