Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Dec. 31, 2018
ASSETS
Securities, at fair value	$ 669,226		$ 684,872
Portfolio loans, net	6,133,650		5,885,652
FHLB and other restricted stock	25,397		29,435
LIABILITIES
Junior subordinated debt securities	45,619		45,619
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	173,609	[1]	155,489	[2]
Securities, at fair value	669,226	[1]	684,872	[2]
Loans held for sale	8,371	[1]	2,371	[2]
Portfolio loans, net	6,133,650	[1]	5,885,652	[2]
Bank owned life insurance	75,386	[1]	73,900	[2]
FHLB and other restricted stock	25,397	[1]	29,435	[2]
Securities held in a deferred compensation plan	5,611	[1]	4,725	[2]
Mortgage servicing rights	4,172	[1]	4,464	[2]
LIABILITIES
Deposits	5,982,692	[1]	5,673,922	[2]
Securities sold under repurchase agreements	13,925	[1]	18,383	[2]
Short-term borrowings	370,000	[1]	470,000	[2]
Long-term borrowings	69,156	[1]	70,314	[2]
Junior subordinated debt securities	45,619	[1]	45,619	[2]
Carrying Value | Interest rate swaps
ASSETS
Derivative financial assets	32,825	[1]	5,504	[2]
LIABILITIES
Derivative financial liabilities	32,772	[1]	5,340	[2]
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	455	[1]	251	[2]
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets	64	[1]	55	[2]
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	173,609		155,489
Securities, at fair value	669,226		684,872
Loans held for sale	8,371		2,469
Portfolio loans, net	6,022,385		5,728,843
Bank owned life insurance	75,386		73,900
FHLB and other restricted stock	25,397		29,435
Securities held in a deferred compensation plan	5,611		4,725
Mortgage servicing rights	4,189		5,181
LIABILITIES
Deposits	5,981,492		5,662,193
Securities sold under repurchase agreements	13,925		18,383
Short-term borrowings	370,000		470,000
Long-term borrowings	69,738		70,578
Junior subordinated debt securities	45,619		45,619
Fair Value Measurements | Interest rate swaps
ASSETS
Derivative financial assets	32,825		5,504
LIABILITIES
Derivative financial liabilities	32,772		5,340
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets	455		251
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets	64		55
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	173,609		155,489
Securities, at fair value	0		0
Loans held for sale	0		0
Portfolio loans, net	0		0
Bank owned life insurance	0		0
FHLB and other restricted stock	0		0
Securities held in a deferred compensation plan	5,611		4,725
Mortgage servicing rights	0		0
LIABILITIES
Deposits	4,656,323		4,261,884
Securities sold under repurchase agreements	13,925		18,383
Short-term borrowings	370,000		470,000
Long-term borrowings	39,329		38,610
Junior subordinated debt securities	45,619		45,619
Fair Value Measurements | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets	0		0
LIABILITIES
Derivative financial liabilities	0		0
Fair Value Measurements | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets	0		0
Fair Value Measurements | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets	0		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0		0
Securities, at fair value	669,226		684,872
Loans held for sale	0		0
Portfolio loans, net	0		0
Bank owned life insurance	75,386		73,900
FHLB and other restricted stock	0		0
Securities held in a deferred compensation plan	0		0
Mortgage servicing rights	0		0
LIABILITIES
Deposits	1,325,169		1,400,309
Securities sold under repurchase agreements	0		0
Short-term borrowings	0		0
Long-term borrowings	30,409		31,968
Junior subordinated debt securities	0		0
Fair Value Measurements | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets	32,825		5,504
LIABILITIES
Derivative financial liabilities	32,772		5,340
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	455		251
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets	64		55
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	0		0
Securities, at fair value	0		0
Loans held for sale	8,371		2,469
Portfolio loans, net	6,022,385		5,728,843
Bank owned life insurance	0		0
FHLB and other restricted stock	25,397		29,435
Securities held in a deferred compensation plan	0		0
Mortgage servicing rights	4,189		5,181
LIABILITIES
Deposits	0		0
Securities sold under repurchase agreements	0		0
Short-term borrowings	0		0
Long-term borrowings	0		0
Junior subordinated debt securities	0		0
Fair Value Measurements | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets	0		0
LIABILITIES
Derivative financial liabilities	0		0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets	0		0
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets	$ 0		$ 0

[1] This table represents only the nonrecurring items that are recorded at fair value in our financial statements.

[2] As reported in the Consolidated Balance Sheets